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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your Class 11 knowledge and support exam preparation. Choose a topic below to get started.
| 48401. |
Aluminium metal (atomic weight = 27 g) crystallises in the cubic system with edge length 4.0 Å. The density of metal is 27.16 amu/Å^(3). Determine the unit cell type and calculate the radius of the Aluminium metal. |
| Answer» <html><body><p><br/></p><a href="https://interviewquestions.tuteehub.com/tag/answer-15557" style="font-weight:bold;" target="_blank" title="Click to know more about ANSWER">ANSWER</a> :<a href="https://interviewquestions.tuteehub.com/tag/fcc-985670" style="font-weight:bold;" target="_blank" title="Click to know more about FCC">FCC</a>, `<a href="https://interviewquestions.tuteehub.com/tag/sqrt2-3056932" style="font-weight:bold;" target="_blank" title="Click to know more about SQRT2">SQRT2</a> Å`</body></html> | |
| 48402. |
Aluminium is usually found in +3 oxidation state. In contrast, thallium exists in +1 and +3 oxidation states. This is due to.... |
| Answer» <html><body><p>Lattice <a href="https://interviewquestions.tuteehub.com/tag/effect-966056" style="font-weight:bold;" target="_blank" title="Click to know more about EFFECT">EFFECT</a><br/> Lanthanoid contraction<br/>Diagonal <a href="https://interviewquestions.tuteehub.com/tag/relationship-1183331" style="font-weight:bold;" target="_blank" title="Click to know more about RELATIONSHIP">RELATIONSHIP</a><br/> Inert pair effect</p>Solution :`+1` is more <a href="https://interviewquestions.tuteehub.com/tag/stable-1223548" style="font-weight:bold;" target="_blank" title="Click to know more about STABLE">STABLE</a> form of Thallium <a href="https://interviewquestions.tuteehub.com/tag/due-433472" style="font-weight:bold;" target="_blank" title="Click to know more about DUE">DUE</a> to inert pair effect. For Tl +1 `gt` +3 oxidation state.</body></html> | |
| 48403. |
Aluminium is used in the extraction of |
| Answer» <html><body><p><a href="https://interviewquestions.tuteehub.com/tag/cr-427229" style="font-weight:bold;" target="_blank" title="Click to know more about CR">CR</a><br/>Fe<br/>Ca<br/><a href="https://interviewquestions.tuteehub.com/tag/mn-548487" style="font-weight:bold;" target="_blank" title="Click to know more about MN">MN</a></p>Solution :<a href="https://interviewquestions.tuteehub.com/tag/aluminium-858823" style="font-weight:bold;" target="_blank" title="Click to know more about ALUMINIUM">ALUMINIUM</a> is <a href="https://interviewquestions.tuteehub.com/tag/used-2318798" style="font-weight:bold;" target="_blank" title="Click to know more about USED">USED</a> in the <a href="https://interviewquestions.tuteehub.com/tag/extraction-981857" style="font-weight:bold;" target="_blank" title="Click to know more about EXTRACTION">EXTRACTION</a> of Cr and Mn.</body></html> | |
| 48404. |
Aluminium is stable in air and water inspite of the fact that it is reactive metal. The reason is that a thin film of its oxide, if formed on its surface which makes it passive for further attack. The layer is so useful that in industry, it is purposely deposited by an electrolytric process called anodizing. Reaction of aluminium with oxygen is highyl exothermic and is called thermite reaction2Al(s)+(3)/(2)O_(2)(g)rarr Al_(2)O_(3)(s), Delta H=-1670 kJThermite reaction finds applications in the metallurgical extraction of many metals from their oxides and for welding of metals. The drawback is that to start the reaction, high temperature is required for which an ignition mixture is used.Thermite mixture used for welding is |
| Answer» <html><body><p>`Fe_(<a href="https://interviewquestions.tuteehub.com/tag/2-283658" style="font-weight:bold;" target="_blank" title="Click to know more about 2">2</a>)O_(3)` and Al powder <br/>BaO and <a href="https://interviewquestions.tuteehub.com/tag/mg-1095425" style="font-weight:bold;" target="_blank" title="Click to know more about MG">MG</a> powder<br/><a href="https://interviewquestions.tuteehub.com/tag/fe-460008" style="font-weight:bold;" target="_blank" title="Click to know more about FE">FE</a> and Al <br/>Cu and Al </p>Solution :3 : 1 <a href="https://interviewquestions.tuteehub.com/tag/ratio-13379" style="font-weight:bold;" target="_blank" title="Click to know more about RATIO">RATIO</a> of `Fe_(2)O_(3)` and Al powder</body></html> | |
| 48405. |
Aluminium is stable in air and water inspite of the fact that it is reactive metal. The reason is that a thin film of its oxide, if formed on its surface which makes it passive for further attack. The layer is so useful that in industry, it is purposely deposited by an electrolytric process called anodizing. Reaction of aluminium with oxygen is highyl exothermic and is called thermite reaction2Al(s)+(3)/(2)O_(2)(g)rarr Al_(2)O_(3)(s), Delta H=-1670 kJThermite reaction finds applications in the metallurgical extraction of many metals from their oxides and for welding of metals. The drawback is that to start the reaction, high temperature is required for which an ignition mixture is used.Anodised aluminium is |
| Answer» <html><body><p>Al obtained at <a href="https://interviewquestions.tuteehub.com/tag/anode-876537" style="font-weight:bold;" target="_blank" title="Click to know more about ANODE">ANODE</a> <br/>Al <a href="https://interviewquestions.tuteehub.com/tag/prepared-1163605" style="font-weight:bold;" target="_blank" title="Click to know more about PREPARED">PREPARED</a> electrolytically<br/>Alloy of Al <a href="https://interviewquestions.tuteehub.com/tag/containing-2035611" style="font-weight:bold;" target="_blank" title="Click to know more about CONTAINING">CONTAINING</a> <a href="https://interviewquestions.tuteehub.com/tag/95-342378" style="font-weight:bold;" target="_blank" title="Click to know more about 95">95</a>% Al <br/>Al electrolytically <a href="https://interviewquestions.tuteehub.com/tag/coated-920548" style="font-weight:bold;" target="_blank" title="Click to know more about COATED">COATED</a> with `Al_(2)O_(3)`</p>Solution :Anodised aluminium is Al electrolytically coated with `Al_(2)O_(3)`</body></html> | |
| 48406. |
Aluminium is quite reactive and hence does not occur in nativie forms. Aluminium is the third most abundnat element in the earth's crust. The important ores of aluminium are i) Bauxite Al_(2)O_(3)2H_(2)O ii) Cryolite Na_(3)AlF_(6) iii) Feldspar KAISi_(3)O_(8) iv) Alunite K_(2)SO_(4)Al_(2)(SO)_(4)Al(OH)_(3) Aluminium is extracted from Bauxite. Bauxite is generally associated with iron oxide and silica as impurity. Bauxite ore containing excess of ferric oxide (Red bauxite) is powdered and digested with a strong solution of caustic soda in an auto clave when alumina (Al_(2)O_(3) passes into solution as sodium aluminate while ferric oxide remains undissolved and is filtered out- Al_(2)O_(3) + 2Na to 2NaAlO_(2) + H_(2)O The solutioin is diluted with water and a small amount of freshly precipated aluminium hydroxidel is added as seeding agent. The precipated Al(OH)_(3) is filtered, washed and ignited to get pure alumina. 2Al(OH)_(3) overset(Delta)to underset("Alumina") Al_(2)O_(3) + 3H_(2)O Pure alumina is dissolved in molten cryolite and is electrolyted using graphite electrodes. Aluminium obtained after this step is 99% pure. It can further be refined by Hoope's process. In electrolysis of Al_(2)O_(3) by Hall and Heroult process |
| Answer» <html><body><p>Cryolite `(Na_(3)AlF_(<a href="https://interviewquestions.tuteehub.com/tag/6-327005" style="font-weight:bold;" target="_blank" title="Click to know more about 6">6</a>)` lowers the melting point of alumina `(Al_(2)O_(3))` and <a href="https://interviewquestions.tuteehub.com/tag/increases-1040626" style="font-weight:bold;" target="_blank" title="Click to know more about INCREASES">INCREASES</a> its eletrical conductivity. <br/>Al is <a href="https://interviewquestions.tuteehub.com/tag/obtained-7273275" style="font-weight:bold;" target="_blank" title="Click to know more about OBTAINED">OBTAINED</a> at cathode and `CO_(2)` at anode.<br/>Both A and <a href="https://interviewquestions.tuteehub.com/tag/b-387190" style="font-weight:bold;" target="_blank" title="Click to know more about B">B</a> are correct<br/>None of A, B are correct. </p>Solution :N//A</body></html> | |
| 48407. |
Aluminium is quite reactive and hence does not occur in nativie forms. Aluminium is the third most abundnat element in the earth's crust. The important ores of aluminium are i) Bauxite Al_(2)O_(3)2H_(2)O ii) Cryolite Na_(3)AlF_(6) iii) Feldspar KAISi_(3)O_(8) iv) Alunite K_(2)SO_(4)Al_(2)(SO)_(4)Al(OH)_(3) Aluminium is extracted from Bauxite. Bauxite is generally associated with iron oxide and silica as impurity. Bauxite ore containing excess of ferric oxide (Red bauxite) is powdered and digested with a strong solution of caustic soda in an auto clave when alumina (Al_(2)O_(3) passes into solution as sodium aluminate while ferric oxide remains undissolved and is filtered out- Al_(2)O_(3) + 2Na to 2NaAlO_(2) + H_(2)O The solutioin is diluted with water and a small amount of freshly precipated aluminium hydroxidel is added as seeding agent. The precipated Al(OH)_(3) is filtered, washed and ignited to get pure alumina. 2Al(OH)_(3) overset(Delta)to underset("Alumina") Al_(2)O_(3) + 3H_(2)O Pure alumina is dissolved in molten cryolite and is electrolyted using graphite electrodes. Aluminium obtained after this step is 99% pure. It can further be refined by Hoope's process. Which one of the following benefication processes is used for the mineral Al_(2)O_(3)2H_(2)O |
| Answer» <html><body><p><a href="https://interviewquestions.tuteehub.com/tag/froth-1000838" style="font-weight:bold;" target="_blank" title="Click to know more about FROTH">FROTH</a> floatation<br/>Leaching<br/>Liquation<br/>Magnetic separation</p>Solution :N//A</body></html> | |
| 48408. |
Aluminium is quite reactive and hence does not occur in nativie forms. Aluminium is the third most abundnat element in the earth's crust. The important ores of aluminium are i) Bauxite Al_(2)O_(3)2H_(2)O ii) Cryolite Na_(3)AlF_(6) iii) Feldspar KAISi_(3)O_(8) iv) Alunite K_(2)SO_(4)Al_(2)(SO)_(4)Al(OH)_(3) Aluminium is extracted from Bauxite. Bauxite is generally associated with iron oxide and silica as impurity. Bauxite ore containing excess of ferric oxide (Red bauxite) is powdered and digested with a strong solution of caustic soda in an auto clave when alumina (Al_(2)O_(3) passes into solution as sodium aluminate while ferric oxide remains undissolved and is filtered out- Al_(2)O_(3) + 2Na to 2NaAlO_(2) + H_(2)O The solutioin is diluted with water and a small amount of freshly precipated aluminium hydroxidel is added as seeding agent. The precipated Al(OH)_(3) is filtered, washed and ignited to get pure alumina. 2Al(OH)_(3) overset(Delta)to underset("Alumina") Al_(2)O_(3) + 3H_(2)O Pure alumina is dissolved in molten cryolite and is electrolyted using graphite electrodes. Aluminium obtained after this step is 99% pure. It can further be refined by Hoope's process. Which of the following metals are extracted by electrolytic reaction |
| Answer» <html><body><p>Copper<br/>Aluminium<br/>Zinc<br/>Silver</p>Solution :N//A</body></html> | |
| 48409. |
Aluminium is quite reactive and hence does not occur in nativie forms. Aluminium is the third most abundnat element in the earth's crust. The important ores of aluminium are i) Bauxite Al_(2)O_(3)2H_(2)O ii) Cryolite Na_(3)AlF_(6) iii) Feldspar KAISi_(3)O_(8) iv) Alunite K_(2)SO_(4)Al_(2)(SO)_(4)Al(OH)_(3) Aluminium is extracted from Bauxite. Bauxite is generally associated with iron oxide and silica as impurity. Bauxite ore containing excess of ferric oxide (Red bauxite) is powdered and digested with a strong solution of caustic soda in an auto clave when alumina (Al_(2)O_(3) passes into solution as sodium aluminate while ferric oxide remains undissolved and is filtered out- Al_(2)O_(3) + 2Na to 2NaAlO_(2) + H_(2)O The solutioin is diluted with water and a small amount of freshly precipated aluminium hydroxidel is added as seeding agent. The precipated Al(OH)_(3) is filtered, washed and ignited to get pure alumina. 2Al(OH)_(3) overset(Delta)to underset("Alumina") Al_(2)O_(3) + 3H_(2)O Pure alumina is dissolved in molten cryolite and is electrolyted using graphite electrodes. Aluminium obtained after this step is 99% pure. It can further be refined by Hoope's process. Which mineral has been named correctly |
| Answer» <html><body><p>Bauxite `(Al_(2)O_(3)2H_(2)O`<br/>Corrundum `Al_(2)O_(3)`<br/><a href="https://interviewquestions.tuteehub.com/tag/cryolite-939968" style="font-weight:bold;" target="_blank" title="Click to know more about CRYOLITE">CRYOLITE</a> `Na_(3)AlF_(6)`<br/>Feldspar `Be_(3)Al_(2)Si_(6)O_(13)`</p><a href="https://interviewquestions.tuteehub.com/tag/solution-25781" style="font-weight:bold;" target="_blank" title="Click to know more about SOLUTION">SOLUTION</a> :N//A</body></html> | |
| 48410. |
Aluminium is quite reactive and hence does not occur in nativie forms. Aluminium is the third most abundnat element in the earth's crust. The important ores of aluminium are i) Bauxite Al_(2)O_(3)2H_(2)O ii) Cryolite Na_(3)AlF_(6) iii) Feldspar KAISi_(3)O_(8) iv) Alunite K_(2)SO_(4)Al_(2)(SO)_(4)Al(OH)_(3) Aluminium is extracted from Bauxite. Bauxite is generally associated with iron oxide and silica as impurity. Bauxite ore containing excess of ferric oxide (Red bauxite) is powdered and digested with a strong solution of caustic soda in an auto clave when alumina (Al_(2)O_(3) passes into solution as sodium aluminate while ferric oxide remains undissolved and is filtered out- Al_(2)O_(3) + 2Na to 2NaAlO_(2) + H_(2)O The solutioin is diluted with water and a small amount of freshly precipated aluminium hydroxidel is added as seeding agent. The precipated Al(OH)_(3) is filtered, washed and ignited to get pure alumina. 2Al(OH)_(3) overset(Delta)to underset("Alumina") Al_(2)O_(3) + 3H_(2)O Pure alumina is dissolved in molten cryolite and is electrolyted using graphite electrodes. Aluminium obtained after this step is 99% pure. It can further be refined by Hoope's process. Principle ore of aluminium is |
| Answer» <html><body><p>Bauxite<br/>Corrundum<br/>Cryolite<br/>Feldspar.</p>Solution :N//A</body></html> | |
| 48411. |
Aluminium is obtained by |
| Answer» <html><body><p> reducing `Al_(2)O_(<a href="https://interviewquestions.tuteehub.com/tag/3-301577" style="font-weight:bold;" target="_blank" title="Click to know more about 3">3</a>)`with coke <br/> electrolysing `Al_(2)O_3` , <a href="https://interviewquestions.tuteehub.com/tag/dissolved-956358" style="font-weight:bold;" target="_blank" title="Click to know more about DISSOLVED">DISSOLVED</a> in `Na_(3) AlF_6 ` <br/>reducing `Al_(2)O_3`with chromium <br/> heating `Al_(2)O_3`and cryolite </p>Answer :<a href="https://interviewquestions.tuteehub.com/tag/b-387190" style="font-weight:bold;" target="_blank" title="Click to know more about B">B</a></body></html> | |
| 48412. |
Aluminium is most abundant in earth's crust, yet it is obtained from bauxite because |
| Answer» <html><body><p>Bauxite is <a href="https://interviewquestions.tuteehub.com/tag/available-888895" style="font-weight:bold;" target="_blank" title="Click to know more about AVAILABLE">AVAILABLE</a> in large quantity<br/>of easy extraction of <a href="https://interviewquestions.tuteehub.com/tag/al-370666" style="font-weight:bold;" target="_blank" title="Click to know more about AL">AL</a> from it <br/>Bauxite contains maximum Al<br/>Bauxite is less impure</p>Solution :Aluminium is most <a href="https://interviewquestions.tuteehub.com/tag/abundant-366375" style="font-weight:bold;" target="_blank" title="Click to know more about ABUNDANT">ABUNDANT</a> in earth's <a href="https://interviewquestions.tuteehub.com/tag/crust-18869" style="font-weight:bold;" target="_blank" title="Click to know more about CRUST">CRUST</a> <a href="https://interviewquestions.tuteehub.com/tag/yet-2343425" style="font-weight:bold;" target="_blank" title="Click to know more about YET">YET</a> it is obtained from bauxite because it is available in large quantity.</body></html> | |
| 48413. |
Aluminium is more reactive thant iron. But aluminium is less easily coroded than iron because: |
| Answer» <html><body><p>ox ygen forms a <a href="https://interviewquestions.tuteehub.com/tag/protective-1170744" style="font-weight:bold;" target="_blank" title="Click to know more about PROTECTIVE">PROTECTIVE</a> <a href="https://interviewquestions.tuteehub.com/tag/oxide-1144484" style="font-weight:bold;" target="_blank" title="Click to know more about OXIDE">OXIDE</a> layer on aluminium <br/>aluminium is a noble metal<br/>iron undergoes reactions easily with water <br/> iron forms <a href="https://interviewquestions.tuteehub.com/tag/mono-11612" style="font-weight:bold;" target="_blank" title="Click to know more about MONO">MONO</a> and divalent <a href="https://interviewquestions.tuteehub.com/tag/ions-1051295" style="font-weight:bold;" target="_blank" title="Click to know more about IONS">IONS</a>. </p><a href="https://interviewquestions.tuteehub.com/tag/answer-15557" style="font-weight:bold;" target="_blank" title="Click to know more about ANSWER">ANSWER</a> :A</body></html> | |
| 48414. |
Aluminiumis "………….." in nature and dissolves in both dilute hydrochloric acid and sodium hydroxideevolving "………….." gas. |
| Answer» <html><body><p><br/></p><a href="https://interviewquestions.tuteehub.com/tag/answer-15557" style="font-weight:bold;" target="_blank" title="Click to know more about ANSWER">ANSWER</a> :<a href="https://interviewquestions.tuteehub.com/tag/amphoteric-374858" style="font-weight:bold;" target="_blank" title="Click to know more about AMPHOTERIC">AMPHOTERIC</a>, `H_(<a href="https://interviewquestions.tuteehub.com/tag/2-283658" style="font-weight:bold;" target="_blank" title="Click to know more about 2">2</a>)`</body></html> | |
| 48415. |
Aluminium is extracted from Alumina (Al_(2)O_3 ) by electrolysis of a molten mixture of |
| Answer» <html><body><p>`Al_(<a href="https://interviewquestions.tuteehub.com/tag/2-283658" style="font-weight:bold;" target="_blank" title="Click to know more about 2">2</a>)O_3` + <a href="https://interviewquestions.tuteehub.com/tag/hf-479831" style="font-weight:bold;" target="_blank" title="Click to know more about HF">HF</a> + `NaAlF_4`<br/>`Al_(2)O_3 + CaF_2 + NaAlF_4`<br/>`Al_(2)O_3` + `Na_(<a href="https://interviewquestions.tuteehub.com/tag/3-301577" style="font-weight:bold;" target="_blank" title="Click to know more about 3">3</a>)AlF_6` + `CaF_2` <br/>`Al_(2)O_3` + <a href="https://interviewquestions.tuteehub.com/tag/kf-532457" style="font-weight:bold;" target="_blank" title="Click to know more about KF">KF</a> + `Na_(2)Al_(6)` </p>Solution :N//A</body></html> | |
| 48416. |
Aluminium is extracted by the electrolysis of |
| Answer» <html><body><p>Bauxite<br/><a href="https://interviewquestions.tuteehub.com/tag/alumina-858813" style="font-weight:bold;" target="_blank" title="Click to know more about ALUMINA">ALUMINA</a><br/>Alumina <a href="https://interviewquestions.tuteehub.com/tag/mixed-561917" style="font-weight:bold;" target="_blank" title="Click to know more about MIXED">MIXED</a> with molten cryolite<br/>Molten cryolite</p>Solution :<a href="https://interviewquestions.tuteehub.com/tag/aluminium-858823" style="font-weight:bold;" target="_blank" title="Click to know more about ALUMINIUM">ALUMINIUM</a> is extracted by the <a href="https://interviewquestions.tuteehub.com/tag/electrolysis-968576" style="font-weight:bold;" target="_blank" title="Click to know more about ELECTROLYSIS">ELECTROLYSIS</a> of alumina (<a href="https://interviewquestions.tuteehub.com/tag/pure-1172806" style="font-weight:bold;" target="_blank" title="Click to know more about PURE">PURE</a> `Al_(2)O_(3)`) mixed with moleten cryolite.</body></html> | |
| 48417. |
Aluminium (III) chloride forms a dimer because |
| Answer» <html><body><p>Higher co-ordination can be <a href="https://interviewquestions.tuteehub.com/tag/achieved-7257144" style="font-weight:bold;" target="_blank" title="Click to know more about ACHIEVED">ACHIEVED</a> by Al<br/>Al has <a href="https://interviewquestions.tuteehub.com/tag/high-479925" style="font-weight:bold;" target="_blank" title="Click to know more about HIGH">HIGH</a> ionisation energy<br/>Al belongs to <a href="https://interviewquestions.tuteehub.com/tag/third-1414358" style="font-weight:bold;" target="_blank" title="Click to know more about THIRD">THIRD</a> group<br/>It can not form a trimer</p>Solution :Aluminium (III) <a href="https://interviewquestions.tuteehub.com/tag/chloride-915854" style="font-weight:bold;" target="_blank" title="Click to know more about CHLORIDE">CHLORIDE</a> forms a dimer because higher co-ordination can be achieved by Al.</body></html> | |
| 48418. |
Aluminium (III) chloride forms a dimer because aluminium |
| Answer» <html><body><p>cannot <a href="https://interviewquestions.tuteehub.com/tag/form-996208" style="font-weight:bold;" target="_blank" title="Click to know more about FORM">FORM</a> a trimer <br/>has <a href="https://interviewquestions.tuteehub.com/tag/high-479925" style="font-weight:bold;" target="_blank" title="Click to know more about HIGH">HIGH</a> <a href="https://interviewquestions.tuteehub.com/tag/ionisation-1051250" style="font-weight:bold;" target="_blank" title="Click to know more about IONISATION">IONISATION</a> energy<br/>belongs to third group<br/>can have higher coordination <a href="https://interviewquestions.tuteehub.com/tag/number-582134" style="font-weight:bold;" target="_blank" title="Click to know more about NUMBER">NUMBER</a>.</p>Solution :can have higher coordination number.</body></html> | |
| 48419. |
Aluminium forms AlF_(6)^(3-)but borondoes not form BF_(6)^(3-).Why so ? |
| Answer» <html><body><p></p>Solution :Al, on the <a href="https://interviewquestions.tuteehub.com/tag/otherhand-2901615" style="font-weight:bold;" target="_blank" title="Click to know more about OTHERHAND">OTHERHAND</a>,<a href="https://interviewquestions.tuteehub.com/tag/due-433472" style="font-weight:bold;" target="_blank" title="Click to know more about DUE">DUE</a> to the persence ofd-orbitals canexlendits valency <a href="https://interviewquestions.tuteehub.com/tag/upto-1440527" style="font-weight:bold;" target="_blank" title="Click to know more about UPTO">UPTO</a> a maximum of 6 andforms `AlF_(6)^(3-)`.</body></html> | |
| 48420. |
Aluminium fluorirde is ionic but aluminium chloride is covalent. Explain |
| Answer» <html><body><p></p>Solution :<a href="https://interviewquestions.tuteehub.com/tag/firstly-462152" style="font-weight:bold;" target="_blank" title="Click to know more about FIRSTLY">FIRSTLY</a>, the electronegitivity differencebetween `Al(1.5)` and `Cl(3.0)` is `1.5` whilethat between `Al(1.5)` and `F(4.0)` is `2.5`. As a result, aluminium-fluorine is ionic while that between aluminium-chloride is covalent. <br/> Secondly, `Al^(3+)` (53.5 pm) is very small as <a href="https://interviewquestions.tuteehub.com/tag/compound-926863" style="font-weight:bold;" target="_blank" title="Click to know more about COMPOUND">COMPOUND</a> to `F^(-)` (136 pm) and `Cl^(-)`(181 pm) . Since <a href="https://interviewquestions.tuteehub.com/tag/according-366619" style="font-weight:bold;" target="_blank" title="Click to know more about ACCORDING">ACCORDING</a> to Fajan rule, the ssame cation can polarize a biggeranion(i.e., `Cl^(-)`)more easily than a <a href="https://interviewquestions.tuteehub.com/tag/smaller-1213327" style="font-weight:bold;" target="_blank" title="Click to know more about SMALLER">SMALLER</a> anion (i.e,`F^(-)`)therefore, `Cl^(-)`can donate electrons back to `Al^(3+)` more easily than `F^(-)`. In other words, `AlCl_(3)` is covalentwhile `AlF_(3)` isionic.</body></html> | |
| 48421. |
Aluminium exhibits diagonal relationship with |
| Answer» <html><body><p>Beryllium<br/>Silicon <br/>Carbon<br/>Germanium</p>Answer :A</body></html> | |
| 48422. |
Aluminium dissolves in mineral acids and aqueous alkalis and thus shows amphoteric character. A piece ofaluminium foil is treated with dilute hydrochloric acid or dilute sodium hydroxide solution in a test tube and on bringing a burning match stick near the mouth of the test tube, a pop sound indicates the evolutionof hydrogen gas. The same activity when performed with concentrated nitric acid, reaction doesn't proceed . Explain the reason. |
| Answer» <html><body><p></p>Solution :Aluminum is amphoteric in nature ,it reacts with acid and base to give salt and `H_2` gas. It burns with <a href="https://interviewquestions.tuteehub.com/tag/pop-592262" style="font-weight:bold;" target="_blank" title="Click to know more about POP">POP</a> <a href="https://interviewquestions.tuteehub.com/tag/sound-648690" style="font-weight:bold;" target="_blank" title="Click to know more about SOUND">SOUND</a> . <br/> `2Al+6HCl to 2AlCl_3 + 3H_2` <br/> `2Al+NaOH + 2H_2O to 2NaAlO_2 + 3H_2` <br/> When Al reacts with conc. `HNO_3` , a <a href="https://interviewquestions.tuteehub.com/tag/thin-707663" style="font-weight:bold;" target="_blank" title="Click to know more about THIN">THIN</a> layer of `Al_2O_3` on the surface of Al metal which protect further reaction. This layer is <a href="https://interviewquestions.tuteehub.com/tag/called-907796" style="font-weight:bold;" target="_blank" title="Click to know more about CALLED">CALLED</a> protective layer. <br/> `2Al+6HNO_3 to Al_2O_3 + 6NO_2 + 3H_2O`</body></html> | |
| 48423. |
Aluminium dissovles in mineral acids and aqueous alkalies and thus shows amphoteric character. A place of aluminum foil is treated with dilute hydrochloric acid or dilute sodium hydroxide solution in a test tube and on bringing a burning match stick near the mouth of the test tube, a pop sound indicates the evolution of hydrogen gas. The same activity when performed with concentrated with concentrated nitric acid. reaction doesn't proceed. Expalin the reason. |
| Answer» <html><body><p></p>Solution :Aluminium being amphoteric in nature dissolves both in acids and alkalies evolving `H_(2)` gas which burns with a <a href="https://interviewquestions.tuteehub.com/tag/pop-592262" style="font-weight:bold;" target="_blank" title="Click to know more about POP">POP</a> sound <br/> `2Al+6HClrarr2AlCl_(3)+3H_(2)` <br/> `2Al+NaOH+2H_(2)Orarrunderset("Sodium meta aluminate")(2NaAlO_(2))+3H_(2)` <br/> But when Al is <a href="https://interviewquestions.tuteehub.com/tag/treated-1426908" style="font-weight:bold;" target="_blank" title="Click to know more about TREATED">TREATED</a> with conc. `HNO_(3)`, a thin protective layer of `Al_(2)O_(3)` is formed on its <a href="https://interviewquestions.tuteehub.com/tag/surface-1235573" style="font-weight:bold;" target="_blank" title="Click to know more about SURFACE">SURFACE</a> which prevents further action <br/> `2Al + 6HNO_(3) <a href="https://interviewquestions.tuteehub.com/tag/rarr-1175461" style="font-weight:bold;" target="_blank" title="Click to know more about RARR">RARR</a> Al_(2)O_(3)+6NO_(2)+3H_(2)O`.</body></html> | |
| 48424. |
Aluminium crystallises in a cubic close packed structure. Is metallic radius is 125 pm. (i) What is the length of the side of the unit cell ? (ii) How many unit cells are there in 1-00 cm^3 of aluminium ? |
| Answer» <html><body><p></p><a href="https://interviewquestions.tuteehub.com/tag/solution-25781" style="font-weight:bold;" target="_blank" title="Click to know more about SOLUTION">SOLUTION</a> :(i)ccp=fcc. For fcc, `a=2sqrt2r`= 2 <a href="https://interviewquestions.tuteehub.com/tag/x-746616" style="font-weight:bold;" target="_blank" title="Click to know more about X">X</a> 4.414 x <a href="https://interviewquestions.tuteehub.com/tag/125-271180" style="font-weight:bold;" target="_blank" title="Click to know more about 125">125</a> pm =354pm<br/> (ii)Volume of one unit cell =`(354xx10^(-<a href="https://interviewquestions.tuteehub.com/tag/10-261113" style="font-weight:bold;" target="_blank" title="Click to know more about 10">10</a>)cm)^3=4.44xx10^(-23) cm^3` <br/> Unit <a href="https://interviewquestions.tuteehub.com/tag/cells-25681" style="font-weight:bold;" target="_blank" title="Click to know more about CELLS">CELLS</a> in `1 cm^3 =1/(4.44xx10^(-23))=2.25xx10^22`</body></html> | |
| 48425. |
Alumiunium chloride exists as dimer, Al_(2)Cl_(6) in solid state as well as in solution of non - polar solvents such as C_(6)H_(6). When dissolved in water it gives : |
| Answer» <html><body><p>`Al_(<a href="https://interviewquestions.tuteehub.com/tag/2-283658" style="font-weight:bold;" target="_blank" title="Click to know more about 2">2</a>)O_3+6HCl`<br/>`[Al(H_(2)O)_(6)]+3C^(-)` <br/>`[Al(<a href="https://interviewquestions.tuteehub.com/tag/oh-585115" style="font-weight:bold;" target="_blank" title="Click to know more about OH">OH</a>)_(6)]^(3-)+<a href="https://interviewquestions.tuteehub.com/tag/3hcl-1862099" style="font-weight:bold;" target="_blank" title="Click to know more about 3HCL">3HCL</a>`<br/>`Al^(3+) +3Cl^(-)`</p>Solution :`AlCl_(3)+6H_(2)O rarr [Al(OH)_2]^(+3)+3HCl+3H^(+)`</body></html> | |
| 48426. |
Aluminium chloride exists as a dime. Give reasons . |
| Answer» <html><body><p></p>Solution :In `AlCl_(3)`, Al hasonly six electrons in the valence shell. Therefore it needs two moreelectrons to completeits octet.To do so, it accepta lone pairof electronsfrom theCl <a href="https://interviewquestions.tuteehub.com/tag/atom-887280" style="font-weight:bold;" target="_blank" title="Click to know more about ATOM">ATOM</a> of another `AlCl_(3)` moleculeas shown. As a <a href="https://interviewquestions.tuteehub.com/tag/result-1187343" style="font-weight:bold;" target="_blank" title="Click to know more about RESULT">RESULT</a> , `AlCl_(3)` exiss as a <a href="https://interviewquestions.tuteehub.com/tag/dimer-954231" style="font-weight:bold;" target="_blank" title="Click to know more about DIMER">DIMER</a>.</body></html> | |
| 48427. |
Aluminium cation is acidic. Why? |
| Answer» <html><body><p></p>Solution :Aluminium <a href="https://interviewquestions.tuteehub.com/tag/cation-910854" style="font-weight:bold;" target="_blank" title="Click to know more about CATION">CATION</a>, `<a href="https://interviewquestions.tuteehub.com/tag/al-370666" style="font-weight:bold;" target="_blank" title="Click to know more about AL">AL</a>^(3+)` has empty orbitals available to accept electrons. Hence, `Al^(3+)` ion is a Lewis acid. `Al^(3+)` cation forms <a href="https://interviewquestions.tuteehub.com/tag/complex-926309" style="font-weight:bold;" target="_blank" title="Click to know more about COMPLEX">COMPLEX</a> <a href="https://interviewquestions.tuteehub.com/tag/ions-1051295" style="font-weight:bold;" target="_blank" title="Click to know more about IONS">IONS</a> like `[AlF_(6)]^(3-) ,[Al(OH)_4(H_2 O)_2 ]^(-)`, etc.` [Al^(3+)+<a href="https://interviewquestions.tuteehub.com/tag/6f-331962" style="font-weight:bold;" target="_blank" title="Click to know more about 6F">6F</a>^(-) to(AIF_(6))]^(3+)`</body></html> | |
| 48428. |
Aluminium becomes passive in |
| Answer» <html><body><p>conc `HNO_3` <br/> `H_(<a href="https://interviewquestions.tuteehub.com/tag/2-283658" style="font-weight:bold;" target="_blank" title="Click to know more about 2">2</a>)Cro_(4)` <br/> `HCIO_(4)` <br/> conc.HCI </p>Solution : <a href="https://interviewquestions.tuteehub.com/tag/due-433472" style="font-weight:bold;" target="_blank" title="Click to know more about DUE">DUE</a> to formation of <a href="https://interviewquestions.tuteehub.com/tag/oxide-1144484" style="font-weight:bold;" target="_blank" title="Click to know more about OXIDE">OXIDE</a> <a href="https://interviewquestions.tuteehub.com/tag/layer-1069875" style="font-weight:bold;" target="_blank" title="Click to know more about LAYER">LAYER</a> on the sur face 3. X is NH,</body></html> | |
| 48429. |
Aluminium alloy with beautiful golden yellow colour used for making artificial jewellery is |
| Answer» <html><body><p>Duraalumin<br/>Magnalium<br/>Alclad<br/><a href="https://interviewquestions.tuteehub.com/tag/aluminium-858823" style="font-weight:bold;" target="_blank" title="Click to know more about ALUMINIUM">ALUMINIUM</a> <a href="https://interviewquestions.tuteehub.com/tag/bronze-904675" style="font-weight:bold;" target="_blank" title="Click to know more about BRONZE">BRONZE</a></p>Solution :Aluminium bronze has a <a href="https://interviewquestions.tuteehub.com/tag/beautiful-389946" style="font-weight:bold;" target="_blank" title="Click to know more about BEAUTIFUL">BEAUTIFUL</a> <a href="https://interviewquestions.tuteehub.com/tag/golden-468941" style="font-weight:bold;" target="_blank" title="Click to know more about GOLDEN">GOLDEN</a> yellow colour.</body></html> | |
| 48430. |
Aluminimumdissolvesin mineralacids and aqueousalkalies and thus showsamphotericcharacter place ofaluminiumfoil istreatedwith dilutehydrochloricacid or dilutesodium hydroxide solutiona test tube andon bringing a burning matchstick near the monthof thetest tube , a pop southindicatesthe evolutionof hydrogengas. Thesame activitywhenperformedwith concentratednitrogen acid, reaction doesn'tproceed. Explain the reason. |
| Answer» <html><body><p></p>Solution :Al being amphoteric dissolvesboth in acidsand alkalies evolving`H_(2)` gas whichburnswith a popsouth<br/> `2Al + 6HCl rarr AlCl_(3) + 3H_(2)` <br/> `2Al + 2NaOH + 2H_(2)O rarr underset(" Sod. Meta-aluminate ")(2 NaAlO_(2)) +3H_(2)`<br/> With <a href="https://interviewquestions.tuteehub.com/tag/conc-927968" style="font-weight:bold;" target="_blank" title="Click to know more about CONC">CONC</a>. `HNO_(3)`, Al becomespassive and the reactiondoes not proceed.This passiveis <a href="https://interviewquestions.tuteehub.com/tag/due-433472" style="font-weight:bold;" target="_blank" title="Click to know more about DUE">DUE</a> to fromationof a thinpratectivelayer of its oxide `(Al_(2)O_(3))` on the surfaceof themetalwhich preventsfurther <a href="https://interviewquestions.tuteehub.com/tag/action-2544" style="font-weight:bold;" target="_blank" title="Click to know more about ACTION">ACTION</a>. <br/> `2Al + 6HNO_(3) rarr Al_(2)O_(3) + 6NO_(2) + 3H_(2)O`.</body></html> | |
| 48431. |
Alumina is |
| Answer» <html><body><p>acidic<br/>Basic <br/><a href="https://interviewquestions.tuteehub.com/tag/amphoteric-374858" style="font-weight:bold;" target="_blank" title="Click to know more about AMPHOTERIC">AMPHOTERIC</a><br/>none of these</p>Solution :Alumina `(Al_(2)O_(3))` is amphoteric is <a href="https://interviewquestions.tuteehub.com/tag/nature-1112013" style="font-weight:bold;" target="_blank" title="Click to know more about NATURE">NATURE</a>. It dissolves both in <a href="https://interviewquestions.tuteehub.com/tag/acids-366963" style="font-weight:bold;" target="_blank" title="Click to know more about ACIDS">ACIDS</a> and alkalies.</body></html> | |
| 48432. |
Alum is used in dyeing industry as |
| Answer» <html><body><p>For fire <a href="https://interviewquestions.tuteehub.com/tag/proofing-607405" style="font-weight:bold;" target="_blank" title="Click to know more about PROOFING">PROOFING</a> fabircs<br/>As <a href="https://interviewquestions.tuteehub.com/tag/first-461760" style="font-weight:bold;" target="_blank" title="Click to know more about FIRST">FIRST</a> -aid for cuts<br/>For <a href="https://interviewquestions.tuteehub.com/tag/softening-647081" style="font-weight:bold;" target="_blank" title="Click to know more about SOFTENING">SOFTENING</a> hard water <br/>As mordant</p>Answer :4</body></html> | |
| 48433. |
Alum is used by dyers of clothes |
| Answer» <html><body><p>for fire proofing fabrics<br/>as first-aid for cuts<br/>for softening <a href="https://interviewquestions.tuteehub.com/tag/hard-1015537" style="font-weight:bold;" target="_blank" title="Click to know more about HARD">HARD</a> water<br/>as mordant</p>Solution :The `Al^(3+)` ions <a href="https://interviewquestions.tuteehub.com/tag/produced-592947" style="font-weight:bold;" target="_blank" title="Click to know more about PRODUCED">PRODUCED</a>, when potash alum is dissolved in water, <a href="https://interviewquestions.tuteehub.com/tag/act-1106" style="font-weight:bold;" target="_blank" title="Click to know more about ACT">ACT</a> as a mordant in the process of <a href="https://interviewquestions.tuteehub.com/tag/dyeing-961072" style="font-weight:bold;" target="_blank" title="Click to know more about DYEING">DYEING</a> of <a href="https://interviewquestions.tuteehub.com/tag/clothes-919776" style="font-weight:bold;" target="_blank" title="Click to know more about CLOTHES">CLOTHES</a>.</body></html> | |
| 48434. |
Alum is found to contain hydrated monovalent cation [M(H_(2)O)_(6)]^(+),trivalent cation [M'(H_(2)O)_(6)]^(3+)and SO_(4)^(2-) in the ratio of |
| Answer» <html><body><p>`1:1:1`<br/>`1:2:3`<br/>`1:3:2`<br/>`1:12`</p><a href="https://interviewquestions.tuteehub.com/tag/answer-15557" style="font-weight:bold;" target="_blank" title="Click to know more about ANSWER">ANSWER</a> :<a href="https://interviewquestions.tuteehub.com/tag/4-311707" style="font-weight:bold;" target="_blank" title="Click to know more about 4">4</a></body></html> | |
| 48435. |
Alum is a water purifier because it |
| Answer» <html><body><p>softness <a href="https://interviewquestions.tuteehub.com/tag/hard-1015537" style="font-weight:bold;" target="_blank" title="Click to know more about HARD">HARD</a> water<br/><a href="https://interviewquestions.tuteehub.com/tag/coagulates-2524026" style="font-weight:bold;" target="_blank" title="Click to know more about COAGULATES">COAGULATES</a> the impurities<br/>destroys the <a href="https://interviewquestions.tuteehub.com/tag/pathogenic-7377648" style="font-weight:bold;" target="_blank" title="Click to know more about PATHOGENIC">PATHOGENIC</a> bacteria<br/>gives taste</p>Solution :<a href="https://interviewquestions.tuteehub.com/tag/alum-373500" style="font-weight:bold;" target="_blank" title="Click to know more about ALUM">ALUM</a> coagulates the suspended or colloidal impurities.</body></html> | |
| 48436. |
Alum helps in purifying water by |
| Answer» <html><body><p><a href="https://interviewquestions.tuteehub.com/tag/forming-12564" style="font-weight:bold;" target="_blank" title="Click to know more about FORMING">FORMING</a> Si complex with clay particles<br/>sulphate part which combines with <a href="https://interviewquestions.tuteehub.com/tag/dirt-955128" style="font-weight:bold;" target="_blank" title="Click to know more about DIRT">DIRT</a> and removes it <br/>aluminium which <a href="https://interviewquestions.tuteehub.com/tag/coagulates-2524026" style="font-weight:bold;" target="_blank" title="Click to know more about COAGULATES">COAGULATES</a> the <a href="https://interviewquestions.tuteehub.com/tag/mud-1104969" style="font-weight:bold;" target="_blank" title="Click to know more about MUD">MUD</a> particles<br/>making mud water soluble.</p>Solution :Alum help in purifying water by `Al^(<a href="https://interviewquestions.tuteehub.com/tag/3-301577" style="font-weight:bold;" target="_blank" title="Click to know more about 3">3</a>+)` ions which coagulate the negative mud particles.</body></html> | |
| 48437. |
Alum helps in purification water by |
| Answer» <html><body><p>forming Si complex with clay particles<br/>sulphate part which <a href="https://interviewquestions.tuteehub.com/tag/combines-922862" style="font-weight:bold;" target="_blank" title="Click to know more about COMBINES">COMBINES</a> with dirt and removes it.<br/>aluminium which <a href="https://interviewquestions.tuteehub.com/tag/coagulates-2524026" style="font-weight:bold;" target="_blank" title="Click to know more about COAGULATES">COAGULATES</a> the <a href="https://interviewquestions.tuteehub.com/tag/mud-1104969" style="font-weight:bold;" target="_blank" title="Click to know more about MUD">MUD</a> particles<br/>making mud water soluble</p>Solution :Alum helps in purifying water by coagulating the negatively charged mud particles with `Al^(3+)` ions provided by it</body></html> | |
| 48438. |
Although the dissolution of ammonium chloride in water is an endothermic reaction, even then it is spontaneous because |
| Answer» <html><body><p>`<a href="https://interviewquestions.tuteehub.com/tag/delta-947703" style="font-weight:bold;" target="_blank" title="Click to know more about DELTA">DELTA</a> <a href="https://interviewquestions.tuteehub.com/tag/h-1014193" style="font-weight:bold;" target="_blank" title="Click to know more about H">H</a>` is <a href="https://interviewquestions.tuteehub.com/tag/positive-1159908" style="font-weight:bold;" target="_blank" title="Click to know more about POSITIVE">POSITIVE</a> , `Delta S` is -ve<br/>`Delta H` is + ve, `Delta S` is zero<br/>`Delta H` is positive, `T Delta S lt Delta H`<br/>`Delta H` is +ve, `Delta S` is positive and `Delta H lt T Delta S`</p>Solution :<a href="https://interviewquestions.tuteehub.com/tag/even-976335" style="font-weight:bold;" target="_blank" title="Click to know more about EVEN">EVEN</a> if `Delta H gt 0`, if `Delta S gt 0 and Delta H - T Delta S lt 0` then spontaneous.</body></html> | |
| 48439. |
Although thallium (Z = 81) has only slightly higher atomic radius (170 pm)than that ofindium (167 pm)butits ionizationenthalpy (589 kJ "mol"^(-1))is much higherthan that ofindium (558 kJ "mol"^(-1)) . Explainwhy / |
| Answer» <html><body><p></p>Solution :Althrough on movingfrom `In (<a href="https://interviewquestions.tuteehub.com/tag/z-750254" style="font-weight:bold;" target="_blank" title="Click to know more about Z">Z</a> = 49)` to `<a href="https://interviewquestions.tuteehub.com/tag/tl-661220" style="font-weight:bold;" target="_blank" title="Click to know more about TL">TL</a> (Z = 81)`, the nuclearincreases by 32units `(81-49)`yet due to poor <a href="https://interviewquestions.tuteehub.com/tag/shielding-1205359" style="font-weight:bold;" target="_blank" title="Click to know more about SHIELDING">SHIELDING</a> effect on intervening 4f- and5d-electrons,effectivenuclear chargeaction on Tl is much higherthan that on Inand hence `Delta_(i)H_(1)`of `Tl`is much higherthan that of `In`.</body></html> | |
| 48440. |
Although ozone is heavier than air, it does not settle down near the earth why ? |
| Answer» <html><body><p></p><a href="https://interviewquestions.tuteehub.com/tag/solution-25781" style="font-weight:bold;" target="_blank" title="Click to know more about SOLUTION">SOLUTION</a> :Ozone is thermodynamically unstable and <a href="https://interviewquestions.tuteehub.com/tag/decomposes-946040" style="font-weight:bold;" target="_blank" title="Click to know more about DECOMPOSES">DECOMPOSES</a> bask to molecular oxygen before <a href="https://interviewquestions.tuteehub.com/tag/reaching-7268689" style="font-weight:bold;" target="_blank" title="Click to know more about REACHING">REACHING</a> <a href="https://interviewquestions.tuteehub.com/tag/near-1112277" style="font-weight:bold;" target="_blank" title="Click to know more about NEAR">NEAR</a> earth's surface.<br/> (ii) As negligible amount of UV - rays reach near the surface the formation of ozone near the surface of earth is <a href="https://interviewquestions.tuteehub.com/tag/rare-613008" style="font-weight:bold;" target="_blank" title="Click to know more about RARE">RARE</a>.</body></html> | |
| 48441. |
Although nitrogen and chlorine have very nearly same electronegativity yet nitrogen forms hydrogen bonding while chlorine does not. Why? |
| Answer» <html><body><p></p>Solution :Due to bigger size of Cl as compared to <a href="https://interviewquestions.tuteehub.com/tag/n-568463" style="font-weight:bold;" target="_blank" title="Click to know more about N">N</a>, electron <a href="https://interviewquestions.tuteehub.com/tag/density-17451" style="font-weight:bold;" target="_blank" title="Click to know more about DENSITY">DENSITY</a> <a href="https://interviewquestions.tuteehub.com/tag/per-590802" style="font-weight:bold;" target="_blank" title="Click to know more about PER">PER</a> unit volume on N is higher than on Cl. As a result N can attract the H aotms of `H_(2)O` more strongly than Cl. <a href="https://interviewquestions.tuteehub.com/tag/thus-2307358" style="font-weight:bold;" target="_blank" title="Click to know more about THUS">THUS</a>, N forms H-bonds but Cl does not.</body></html> | |
| 48442. |
Although nitrogen does not absorb on the surface at the room temperature, it absorbs on the same surface at 83 K. Which one of the following statement is correct ? |
| Answer» <html><body><p>At 83 <a href="https://interviewquestions.tuteehub.com/tag/k-527196" style="font-weight:bold;" target="_blank" title="Click to know more about K">K</a>, there is formation of monomolecular layer<br/>At 83 K, there is formation of multi molecular layer<br/>At 83 K, nitrogen molecules are held by chemical bonds.<br/>At 83 K, nitrogen is <a href="https://interviewquestions.tuteehub.com/tag/absorbed-846166" style="font-weight:bold;" target="_blank" title="Click to know more about ABSORBED">ABSORBED</a> as atoms.</p>Solution :At 83K there is physisorption and hence multimolecular layer <a href="https://interviewquestions.tuteehub.com/tag/formed-464209" style="font-weight:bold;" target="_blank" title="Click to know more about FORMED">FORMED</a>..</body></html> | |
| 48443. |
Although heat is a path function but heat absorbed by the system under certain specific conditions is independent of path. What are those conditions ? Explain. |
| Answer» <html><body><p></p>Solution :The two conditions under which heat <a href="https://interviewquestions.tuteehub.com/tag/becomes-1994370" style="font-weight:bold;" target="_blank" title="Click to know more about BECOMES">BECOMES</a> independent of path are <br/> (i) when volume remains constant <br/> (ii) when pressure remains constant <br/> Explanation <br/> (i) At contant volume. By first <a href="https://interviewquestions.tuteehub.com/tag/law-184" style="font-weight:bold;" target="_blank" title="Click to know more about LAW">LAW</a> of thermodynamics, `<a href="https://interviewquestions.tuteehub.com/tag/delta-947703" style="font-weight:bold;" target="_blank" title="Click to know more about DELTA">DELTA</a> U = <a href="https://interviewquestions.tuteehub.com/tag/q-609558" style="font-weight:bold;" target="_blank" title="Click to know more about Q">Q</a> + W " or " q = Delta U - W`. But `W = - p Delta V` <a href="https://interviewquestions.tuteehub.com/tag/hence-484344" style="font-weight:bold;" target="_blank" title="Click to know more about HENCE">HENCE</a>, `q = Delta U + p Delta V`. But as volume remains constant `Delta V = 0` <br/> `:. q_(v) = Delta V " but " Delta U` is a state function. <br/> Hence, `q_(v)` is a state function. <br/> (ii) At constant pressure. As we know, `q_(p) = Delta U + p Delta V`. But `Delta U + p Delta V = Delta H`. <br/> `:. q_(P0 = Delta H`, as `Delta H` is a state function therefore, `q_(p)` is a state function.</body></html> | |
| 48444. |
Although geometries of NH_3 and H_2O molecules are distorted tetrahedral,bond angle in water is less than that of ammonia.Discuss. |
| Answer» <html><body><p></p>Solution :In `NH_3`,there is only one pair on nitrogen atom to repel the <a href="https://interviewquestions.tuteehub.com/tag/bond-900583" style="font-weight:bold;" target="_blank" title="Click to know more about BOND">BOND</a> pairs <a href="https://interviewquestions.tuteehub.com/tag/whereas-2326610" style="font-weight:bold;" target="_blank" title="Click to know more about WHEREAS">WHEREAS</a> in `H_2O`, there are two lone pairs on <a href="https://interviewquestions.tuteehub.com/tag/oxygen-1144542" style="font-weight:bold;" target="_blank" title="Click to know more about OXYGEN">OXYGEN</a> atom to repel the bond pairs.Hence the repulsion on bond pairs is greater in `H_2O`, than in `NH_3` and so the bond <a href="https://interviewquestions.tuteehub.com/tag/angle-875388" style="font-weight:bold;" target="_blank" title="Click to know more about ANGLE">ANGLE</a> is <a href="https://interviewquestions.tuteehub.com/tag/less-1071906" style="font-weight:bold;" target="_blank" title="Click to know more about LESS">LESS</a>.</body></html> | |
| 48445. |
Although geometries of NH_(3) and H_(2)O molecules are distorted terahedral bond angle in water is less than that of ammonia. Discuss. |
| Answer» <html><body><p></p>Solution :In `NH_(3)` on N only one lone pair and <a href="https://interviewquestions.tuteehub.com/tag/three-708969" style="font-weight:bold;" target="_blank" title="Click to know more about THREE">THREE</a> N - H bonding pair are present so it is `AB_(3)`E type molecule.<br/> In `H_(2)`O one lone pair so due to repulsion it has trigonal pyramidal <a href="https://interviewquestions.tuteehub.com/tag/shape-1204673" style="font-weight:bold;" target="_blank" title="Click to know more about SHAPE">SHAPE</a> and H - N - H bond angle is `<a href="https://interviewquestions.tuteehub.com/tag/107-266703" style="font-weight:bold;" target="_blank" title="Click to know more about 107">107</a>^(@)` while in `H^(2)`O due to repulsion of two lone pair `H_(2)`O has <a href="https://interviewquestions.tuteehub.com/tag/bent-395665" style="font-weight:bold;" target="_blank" title="Click to know more about BENT">BENT</a> shape and bond angle is `10.5^(@)`.<br/> <img src="https://doubtnut-static.s.llnwi.net/static/physics_images/KPK_AIO_CHE_XI_P1_C04_E01_055_S01.png" width="80%"/></body></html> | |
| 48446. |
Although geometries of NH_(3) and H_(2)O moleculesare distorted tetrahedral, bond angle in water is less than that of ammonia. Discuss. |
| Answer» <html><body><p></p>Solution :`NH rarr NH_(3)` <br/> `H_(2)O rarr H_(2)O:` <br/> Because of two lone pair of electrons on O-atom, repulsion on bond <a href="https://interviewquestions.tuteehub.com/tag/pairs-1145786" style="font-weight:bold;" target="_blank" title="Click to know more about PAIRS">PAIRS</a> is greater in `H_(2)O` in <a href="https://interviewquestions.tuteehub.com/tag/comparison-11472" style="font-weight:bold;" target="_blank" title="Click to know more about COMPARISON">COMPARISON</a> to `NH_(3)`. <a href="https://interviewquestions.tuteehub.com/tag/thus-2307358" style="font-weight:bold;" target="_blank" title="Click to know more about THUS">THUS</a>, the bond angle is less in `H_(2)O` molecules.</body></html> | |
| 48447. |
Although geometries of NH_(3) and H_(2) Omolecules are distorted tetrahedral, bond angle in water is less thenthat of ammonia.Discuss . |
| Answer» <html><body><p></p>Solution :In ` NH_(<a href="https://interviewquestions.tuteehub.com/tag/3-301577" style="font-weight:bold;" target="_blank" title="Click to know more about 3">3</a>)`, there is only one lone pair on N-atom to <a href="https://interviewquestions.tuteehub.com/tag/repel-1185152" style="font-weight:bold;" target="_blank" title="Click to know more about REPEL">REPEL</a> the bond pairs whereas in ` H_(2)O` , there are <a href="https://interviewquestions.tuteehub.com/tag/two-714195" style="font-weight:bold;" target="_blank" title="Click to know more about TWO">TWO</a> lone<br/>pairs on O-atom to repel the bond paris . Hence the repulsions on bond pairs are <a href="https://interviewquestions.tuteehub.com/tag/greater-476627" style="font-weight:bold;" target="_blank" title="Click to know more about GREATER">GREATER</a> in ` H_(2) O `than in<br/> ` NH_(3)` andhence the bond angle is <a href="https://interviewquestions.tuteehub.com/tag/less-1071906" style="font-weight:bold;" target="_blank" title="Click to know more about LESS">LESS</a>.</body></html> | |
| 48448. |
Although for Mg, Delta_iH(378 kJ mol^(-1)) is greater than Delta_iH_2 (1450 kJ mol^(-1)), Mg prefers to form MgCl_2 rather than MgCl because |
| Answer» <html><body><p>`<a href="https://interviewquestions.tuteehub.com/tag/mg-1095425" style="font-weight:bold;" target="_blank" title="Click to know more about MG">MG</a>^(2+)` ion has the noble gas configuration<br/>`Mg^(2+)` ion is smaller than `Mg^(+)`<br/> `Mg^(2+)` ion has <a href="https://interviewquestions.tuteehub.com/tag/higher-1022060" style="font-weight:bold;" target="_blank" title="Click to know more about HIGHER">HIGHER</a> <a href="https://interviewquestions.tuteehub.com/tag/charge-914384" style="font-weight:bold;" target="_blank" title="Click to know more about CHARGE">CHARGE</a> than `Mg^(+)` ion<br/>the lattice enthalpy of `MgCl_2` is very high</p>Solution :Lattice enthalpy of `MgCl_2(2527 kJ mol^(-1))` is more than <a href="https://interviewquestions.tuteehub.com/tag/enough-446095" style="font-weight:bold;" target="_blank" title="Click to know more about ENOUGH">ENOUGH</a> to <a href="https://interviewquestions.tuteehub.com/tag/compensate-925490" style="font-weight:bold;" target="_blank" title="Click to know more about COMPENSATE">COMPENSATE</a> for the energy needed to remove the first two electrons from an `Mg` atom (`738 kJ mol^(-1)+1450 kJ mol^(-1)=2188 kJ mol^(-1)`).</body></html> | |
| 48449. |
Although fluorine ismuch more electronegative then hydrogen yet the dipole moment of NF_(3) (0-24 D) is much lower than that of NH_(3) (1-46 D). Explain. |
| Answer» <html><body><p></p>Solution :The dipole moment of <a href="https://interviewquestions.tuteehub.com/tag/molecules-563030" style="font-weight:bold;" target="_blank" title="Click to know more about MOLECULES">MOLECULES</a> having lone <a href="https://interviewquestions.tuteehub.com/tag/pairs-1145786" style="font-weight:bold;" target="_blank" title="Click to know more about PAIRS">PAIRS</a> andpolar bonds is the vector sum of the following two moments. <br/> (i) Dipole moment of the lone pair/s <br/> (ii) Resultant of the dipole moments of polar bonds. <br/> Now both `NH_(3)andNF_(3)` have pyramidal sturctures with FNF and HNH bond <a href="https://interviewquestions.tuteehub.com/tag/angles-378243" style="font-weight:bold;" target="_blank" title="Click to know more about ANGLES">ANGLES</a> of `102.4^(@)and107.8^(@)` respectively. The direction of the dipole moment of the lone pair is in the same direction, i.e., away from the N atom as indicated in the Fig. 11.37 <br/> Since N is more electronegative than H, therefore, the direction of the N-H bond moments is from H to N. The resultant of these three bonds adds to the moment of lone pair hence the net dipole moment of `NH_(3)` is1.46 D. <br/> In contrast, F is more electronegative than N and hence the direction of the N-F bond moments is from N to F. The reusltant of these three dipole moments opposes the dipole moment of the lone pair and thus partly <a href="https://interviewquestions.tuteehub.com/tag/cancels-908215" style="font-weight:bold;" target="_blank" title="Click to know more about CANCELS">CANCELS</a> the resultant of the dipole moments of the three N-H bonds in`NH_(3)`. In other words, the only difference if that in case of `NF_(3)`, the dipole moments of the lone pair. Consequently, `NF_(3)` has a much <a href="https://interviewquestions.tuteehub.com/tag/lower-1080637" style="font-weight:bold;" target="_blank" title="Click to know more about LOWER">LOWER</a> dipole moment (0.24 D) than that of `NH_(3)` (1.46 D). <br/> <img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/PR_CHE_02_XI_C11B_E04_012_S01.png" width="80%"/></body></html> | |
| 48450. |
Although every element is different from every other element, yet some elements have certain similarities. Based upon these similarities, the scientists after numerous attempts were are given. Based upon these multiple choice questions are ultimately sucessful in arranging the various elements into groups or chemical families in such a way that similar elements were put together. This arrangement of elements is calledclassification of elements and this led to the formulation of a periodic table. The periodic table is the most organising principle in chemistry. If you know the properties of any element in a group, or of the columns, of the periodic table, you can make a good guess atthe properties of every other element in the same group and even the elements in the neighbouring groups. The first break through in the classification of elements, was provided by Russian chemist Dmitri lunovich Mendeleev. Taking thechemistry of the elements as his primary organising principle, he arranged the known elements by atomic mass and grouped them together according to their chemical reactivity He also observed that there occurred recurrence of elements with similar physical and chemical properties after certain regular intervals. On the basis of these similarities Mendeleev proposed his periodic law which states that physical and chemical properties of lementsare a periodic function of their atomic masses Moseley suggested that atomic number was a better fundamental property of an element than its atomic mass. This forms the basis of the Modern periodic law. Thus, modern periodiclaw states that physical and chemical properties of the elements are a periodic function of their atomic numbers.In the modern long form of periodic table the elements are arranged in the increasing orderof their atomic numbers and the elements with similar properties repeat after regular intervals. Repetition of chemical properties of elementsat regular intervals when arranged in a definiteorder is called periodicity of properties. This is due the recurrence of similar outer electronic configuration at certain regular intervals. The long form of periodic table may be divided into four main blocks known as s, p, d and f blocks depending upon the type of orbitals being filledup with the increase in atomic number in atoms of the elements. The nature of the block to which an element belongs depends upon the type of subshell which receives the last electron. The electronic configuration of the element which is just above the element with atomic number 43 in the same periodic group |
| Answer» <html><body><p>`1s^(2)<a href="https://interviewquestions.tuteehub.com/tag/2s-301125" style="font-weight:bold;" target="_blank" title="Click to know more about 2S">2S</a>^(2)2p^(<a href="https://interviewquestions.tuteehub.com/tag/6-327005" style="font-weight:bold;" target="_blank" title="Click to know more about 6">6</a>)<a href="https://interviewquestions.tuteehub.com/tag/3s-311333" style="font-weight:bold;" target="_blank" title="Click to know more about 3S">3S</a>^(2)3p^(6)3d^(5)4s^(2)`<br/>`1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(10)4s^(2)<a href="https://interviewquestions.tuteehub.com/tag/5p-326565" style="font-weight:bold;" target="_blank" title="Click to know more about 5P">5P</a>^(5)`<br/>`1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)4s^(1)`<br/>`1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(10)4s^(1)4p^(6)`</p>Answer :A</body></html> | |