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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 89251. |
A group of atoms can function as a ligand only when: |
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Answer» It is a small molecule |
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| 89252. |
A is |
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Answer» an alkyne |
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| 89253. |
A group of atoms can function as a ligand only when |
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Answer» it is a small molecule |
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| 89254. |
(A) is: |
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Answer» a.  So the answer is `(b)`. |
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| 89255. |
A group of acidic oxide is |
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Answer» `CrO_(3),Mn_(2)O_(7)` `CrO_(3)+H_(2)Orarrunderset("acid")underset("Chromic")(H_(2)CrO_(4)),Mn_(2)O_(7)+H_(2)Orarrunderset("acid")underset("Permagnic")(2HMnO_(4))` |
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| 89256. |
A group closely related compounds which can be expressed by a general formula and in which two consecutive members differ by 14 in their molecular masses is called: |
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Answer» a HOMOLOGOUS SERIES |
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| 89257. |
A is : |
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Answer»
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| 89258. |
A group 14 elements is oxidised to form corresponding oxide which is gaseous in nature , when dissolved in water pH of the water decrease further addition of group 2 hydroxides leads to precipitation. This oxide can be |
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Answer» `GeO_(2)` |
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| 89259. |
(A) Group 18 elements are called noble gases(R) group 18 elements form only very few compounds |
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Answer» Both (A) and (R) are true and (R) is the CORRECT explanation of (A) |
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| 89260. |
A group 14 element is to be converted into ntype semiconductor by doping it with a suitable impurity. To which group should this impurity belong ? |
| Answer» Solution :To MAKE n-type semiconductors, group-14 ELEMENT MUST be doped with group-15 elements. | |
| 89261. |
(A): Iron pyrate is used in the extraction of iron releases pollutants like sulphurdioxide (R) : Ores which are abundent with non metals produce poluting gases |
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Answer» Both (A) and (R) are TRUE and (R) is the CORRECT explanation of (A) |
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| 89262. |
A group 14 element is to be converted into n-type semiconductor by doping it with a suitable impurity. To which group should this impurity belong? |
| Answer» SOLUTION :GROUP 15, group 14 elements doppped with electron rich group 15 elements make n TYPE SEMICONDUCTORS. | |
| 89263. |
(A) Iron metal is refined in blast furnace (R) Blast furnace is used to perform roasting |
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Answer» Both (A) and (R) are TRUE and (R) is the correct explanation of (A) |
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| 89264. |
(A) Ionic solids conduct electricity in solid state. (R) Their conduction is due to the presence of electrons |
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Answer» Both (A) and (R) are TRUE and (R) is the CORRECT explanation of (A) |
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| 89265. |
A :Grignard's reagent is prepared in the presence of ether .R : Grignard's reagent is soluble and stable in ether. |
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Answer» If both ASSERTION & Reason are TRUE and the reason is the correct explanation of the assertion, then mark (1) |
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| 89266. |
(A) Ionic solids are characterized by high melting and boiling point. (R) Ionic solids have coulombic forces of attraction between their ions. |
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Answer» Both (A) and (R) are TRUE and (R) is the correct EXPLANATION of (A) |
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| 89267. |
(A) : lodine is the only halogen that is naturally available in positive oxidation states (R): Iodine is slightly electropositive among halogens . |
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Answer» Both (A) and (R ) are TRUE and (R ) is the CORRECT explanation of (A) |
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| 89268. |
A grignard reagent is prepared by reacting magnesium: |
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Answer» METHYL amine |
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| 89269. |
(A) Iodine oxides are more stable than chlorine and bromine oxides (R ) Iodine is the solid halogen ,but chlorine and bromine are gaseous and liquid halogens |
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Answer» Both (A) and (R ) are true and (R ) is the correct explanation of (A) |
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| 89270. |
A greenish yellow gas reacts withh an alkali metal hydroxide to form a halate, which can be used in: |
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Answer» `Br_(2),KBrO_(3)`<BR>`Cl_(2),KClO_(3)` |
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| 89271. |
(A) :Grignard synthesis is always carried out in ethereal solution. (R) H_2Ois polar solvent . |
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Answer» Both A & R are TRUE, R is the CORRECT explanation of A |
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| 89272. |
(A) Iodine is least basic whereas fluorine is most basic , among halogens (R ) The reactivity of halogens increases from fluorine to iodine |
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Answer» Both (A) and (R ) are TRUE and (R ) is the CORRECT explanation of (A) |
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| 89273. |
(A) Iodine does not react with water (R ) Reaction of iodine with water is non spontaneous |
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Answer» Both (A) and (R ) are TRUE and (R ) is the correct explanation of (A) |
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| 89274. |
A greenishyellowgas (B) is obtainedwhena mixtureof a blackpowder (A), NaCl andand concH_(2)SO_(4)is heated. When gas (B)is passedthrough liquorammonia , N_(2) gas is liberated . Whenone fo thecompounds obtainedby passing the gas (B) throughhot KOHsolutionis heated with (A), O_(2)is obtained . Identify (A) &(B) and writethe reactions involved . |
| Answer» SOLUTION :A : `MnO_(2), B: Cl_(2)` | |
| 89275. |
(A) Iodine is dissolved well in aqueous KI solution (R ) Iodine forms a complex tri -iodide ion in aqueous KI solution |
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Answer» Both (A) and (R ) are TRUE and (R ) is the CORRECT EXPLANATION of (A) |
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| 89276. |
A greenish yellow gas reacts with an alkali metal hydroxide to form a halate which can be used in fire works safety matches. The gas and halate respectively are |
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Answer» `Br_(2)KBrO_(3)` `KClO_(3)` is used in FIRE works and safety MATCHES and `Cl_(2)` is greenish yellow gas. |
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| 89277. |
(A) Insulators are generally good conductors(R) Insulators have free electrons |
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Answer» Both (A) and (R) are TRUE and (R) is the correct EXPLANATION of (A) |
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| 89278. |
A greenish yellow gas ‘X’ is passed through water to form a saturated solution. The aqueous solution on treatment with silver nitrate solution gives a white precipitate. The saturated aqueous solution also dissolves magnesium ribbon with the evolution of a colourless gas ‘Y’. Identify gases ‘X’ and ‘Y’. |
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Answer» Solution :`UNDERSET(X)(Cl_(2))+H_(2)OrarrHCl+HClO` `AgNO_(3)+HClrarrunderset(("whiteppt."))(AgCl)+HNO_(3)` `Mg+2HClrarrunderset(("Y"))(MgCl_(2))+H_(2)` |
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| 89279. |
(A): lodine appears in violet colour. (R): Iodine absorbsviolet part of electro magnetic radiation . |
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Answer» Both (A) and (R ) are true and (R ) is the CORRECT explanation of (A) |
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| 89280. |
A greenish-yellow coloured gas is liberated on heating a mixture of "_______________" |
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Answer» `NACL + H_(2) SO_(4)` |
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| 89281. |
(A): Iodine displaces bromine from KBrO_3 (R): Iodine is strong oxidizing agent than bromine. |
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Answer» Both (A) and (R ) are TRUE and (R ) is the CORRECT EXPLANATION of (A) |
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| 89282. |
A greenish-yellow coloured gas is liberated on heating a mixture of two substances which are: |
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Answer» KBR + HCL |
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| 89283. |
(a)Indicate whether the following are S_(N^(1)),S_(N^(2)),E_(1) " or "E_(2) reactions. (i) CH_(3)CH_(2)CH_(2)CI+I^(-) to (ii) (CH_(3))_(3) CBr+CN^(-)(alc.) to (iii) CH_(3)CH(Br)CH_(3) +OH^(-) (alc.) to(iv) (CH_(3))_(3) C-Br+H_(2)O to (b) Give the decreasing order of reactivity of the alkaline hydrolysis of the following alkyl halides toward (A)S_(N^(1))(B) S_(N^(2))(C) in pressure of AgNO_(3). (i) (CH_(3))_(2)C(Br) -C_(2)H_(5) (ii)C_(5)H_(11)Br(iii) C_(2)H_(5)CH(Br)C_(2)H_(5) (c) Give the decreasing order reactivity of the alkaline hydrolysis of hte followinghalides towards S_(N^(1)) (i) MeCI (ii) PhCH_(2)CI(ii)Ph_(2)CHCI(iii)Ph_(3)C-CI. (d) Determine the relative S_(N^(2)) reactivity with NaCI in aprotic DMSO of the following alkyl halides : (A) (i) CH_(3)CHCICH_(2)CH_(3)(ii)CH_(3)CHBrCH_(2)CH_(3) (iii) CH_(3)CHICH_(2)CH_(3)(B) (i) CH_(3)CH(CH_(3))CH_(2)CH_(2)I(ii) CH_(3)CH(CH_(3))CHICH_(3)(iii) CH_(3)CI(CH_(3))CH_(2)CH_(3)(e) Arrange the following in the order of decreasing nucleophilic character: H_(2)O,^(-)OH,CH_(3)O^(-), CH_(3)COO^(-)(f) Arrange thefollowing in the decreasing order as leaving group in S_(N) reaction: CH_(3)COO^(-),C_(6)H_(5)O^(-), C_(6)H_(5)SO_(3)^(-), CH_(3)O^(-) |
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Answer» Solution :`(a) (i) CH_(3)CH_(2)CH_(2)-I " is" S_(N^(2)) " reaction "(1^(@)"halide and " I^(-)` is a good nucleophile and poor base. `(II) CH_(3)CH=CH_(2) " is " E_(2)` reaction, less polar SOLVENT favours `E_(2)`. `(iv) (CH_(3))_(3)C-OH " is "S_(N^(1))` reaction as `H_(2)O` is not basic enough to remove a proton to give ELIMINATION reaction. `(b) (A) (i) gt (iii) (3^(@) gt 2^(@) gt 1^(@)" alkyl halides ")S_(N^(1))`. `(B) (ii) gt (iii) gt (i) (1^(@) gt 2^(@) gt 3^(@) " alkyl halides")S_(N^(2)).` `(C) (i) gt (iii) gt (ii) : " Heavy ions such as " Ag^(+)" or " Pb^(2+) " catalyse " S_(N^(1))`. `(C) (iv) Ph_(3) C-CI gt (iii) Ph_(2) CH-CI gt (ii) PhCH_(2) -CI gt (i) NeCI.` `(d) (A) (iii) gt (ii) gt (i) ("Group leaving ability is " I^(-) gt Br^(-) gt CI^(-))` `(B) (i) gt (ii) gt (iii) ("steric factor MAKES the reactivity " 1^(@) gt2^(@) gt 3^(@))`. (e) When the NUCLEOPHILIC centre is same . The nucleophilicity is same as basic character. Acidic character :`H_(3)O^(+) gt CH_(3)COOHgt CH_(3)OH gt H_(2)O.` Basicity and nucleophilicity : `H_(2)O lt CH_(3)COO^(-) lt CH_(3)O^(-) lt OH^(-)`. (f) Weaker thebase or stronger the acid, better is the leaving group. Acidic character : `C_(6) H_(5)SO_(3)H gt CH_(3)COOH gt C_(6)H_(5)OH gt CH_(3) OH.` |
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| 89284. |
A green ore (A) of a metal present as a double /mixed compound is treated with HCl and then H_(2)S is passed in the solution. A back precipitate (B) is obtained, that is insoluble in yellow ammonium sulphide. The precipitate is dissolved in HNO_(3) and then excess of NH_(4)OH is added. The solution becomes coloured but this colour is discharged upon addition of KCN in excess due to the formation of compound (C). The solution of (A) in H_(2)O liberates a colourless and odourless gas on reaction with dilute H_(2)SO_(4) and solution of (A) gives white precipitate on addition of BaCl_(2) solution. The procedure used to estimate the metal ion of ore (A) gravimetrically, is ? |
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Answer» Treatement of ore with excess KCN |
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| 89285. |
A green ore (A) of a metal present as a double /mixed compound is treated with HCl and then H_(2)S is passed in the solution. A back precipitate (B) is obtained, that is insoluble in yellow ammonium sulphide. The precipitate is dissolved in HNO_(3) and then excess of NH_(4)OH is added. The solution becomes coloured but this colour is discharged upon addition of KCN in excess due to the formation of compound (C). The solution of (A) in H_(2)O liberates a colourless and odourless gas on reaction with dilute H_(2)SO_(4) and solution of (A) gives white precipitate on addition of BaCl_(2) solution. After dissolving the precipitate in HNO_(3) aqueous K_(4)[Fe(CN)_(6)] is added and a precipitate is formed. |
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Answer» It is a reddish brown precipitate of `Cu_(2)[Fe(CN)_(6)]`. |
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| 89286. |
(A) Inductive and electromeric effects require polar nature in the molecule. (R) Polar nature in inductive effect isa must but not necessarily in electromeric effect. |
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Answer» If both (A) and(R) are CORRECT and (R) is the correct EXPLANATION of (A). |
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| 89287. |
A green ore (A) of a metal present as a double /mixed compound is treated with HCl and then H_(2)S is passed in the solution. A back precipitate (B) is obtained, that is insoluble in yellow ammonium sulphide. The precipitate is dissolved in HNO_(3) and then excess of NH_(4)OH is added. The solution becomes coloured but this colour is discharged upon addition of KCN in excess due to the formation of compound (C). The solution of (A) in H_(2)O liberates a colourless and odourless gas on reaction with dilute H_(2)SO_(4) and solution of (A) gives white precipitate on addition of BaCl_(2) solution. The green ore (A) is ? |
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Answer» `CuSO_(4). Cu(OH)_(2)` |
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| 89288. |
(A) In vapour state S_(2) molecule is paramagnetic like O_(2) (R ) S_(2) molecule in vapour state contains two unpaired electrons in bonding molecular orbitals |
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Answer» Both (A) and (R ) are TRUE and (R ) is the CORRECT explanation of (A) |
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| 89289. |
A green mass isformedin the charcoulcavity test when a colourless salt (X) is fussed withchbalt mitrate (X) may contain |
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Answer» Aluminium `ZnSO_(4) + Na_(2)CO_(3) RARR ZnCO_(3) + NASO_(4)` `ZnCO_(3) rarr ZnO + CO_(2)` `2Co(NO_(3))_(2) rarr 2CoO + 4NO_(2) + O_(2)` `CoO + ZnO rarrunderset((Green))(CoZnO_(2))` |
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| 89290. |
(a) In the titration of FeSO_(4) with KMnO_(4) in the acidic medium, why is dil. H_(2)SO_(4) used instead of dil. HCI ? (b) Give reasons : (i) Among transition metals, the highest oxidation state is exhibited in oxoanions of a metal. (ii) Ce^(4+) is used as an oxidising agent in volumetric analysis. (iii) Transition metals form a number of interstitial compounds. (iv) Zn^(2+) salts are white while Cu^(2+) salts are blue. |
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Answer» Solution :(a) HCl gets oxidised to `Cl_(2)` by `KMnO_(4)` whereas `H_(2)SO_(4)` does not. (b) (i) METAL oxoanion may be represented as `MO_(x)^(y-)` where y ranges between 1 to 2 and x ranges between 2 to 4. On calculation of oxidation state of the metal in oxoanion, we find that it is the maximum. (ii) `Ce^(4+)` can gain an electron and, therefore, it acts as an oxidising AGENT. `Ce^(4+)+e^(-)toCe^(3+)` (iii) These elements have VOIDS in which small atoms like C, B can fit TIGHTLY to give interstitial compounds. (iv) `Zn^(2+)` does not have vacant d-orbitals or unpaired electrons in d-orbital. `Cu^(2+)` has ONE unpaired electron and vacant d-orbitals. |
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| 89291. |
A green chromium compound (B) which on acidification gives a orange coloured compound |
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Answer» Solution :`A : FeCr_(2) O_(4) "" B: Na_(2)Cr_(4)"" C: Na_(2)Cr_(2) O_(7)` `4FeCr_(2) O_(4) + 8Na_(2) CO_(3) + 7O_(2) to8Na CrO_(4) + 2Fe_(2) O_(3) + 8CO_(2)` `(A)"" (B )` `Na_(2) CrO_(4)+ H_(2) SO_(4) to Na_(2) Cr_(2) O_(7) + Na_(2) SO_(4) + H_(2) O` |
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| 89292. |
A green mass is formed in the charcoal cavity test when a colourless salt (X) is fused with cobalt nitrate. X contains |
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Answer» `Al^(3+)` |
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| 89293. |
(A): In the smelting of copper pyrites in blast furnace, Cu_2 S formed but not FeS. (R) : Cu has greater affinity to 'S' than to 'O' where as Fe has greater affinity to 'O' than to 'S'. |
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Answer» Both (A) and (R) are TRUE and (R) is the CORRECT EXPLANATION of (A) |
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| 89294. |
A green chromium compound (C). Identify A, B, C. Write equations for reactions. |
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Answer» SOLUTION :`A : FeCr_(2) O_(4) "" B: Na_(2)Cr_(4)"" C: Na_(2)Cr_(2) O_(7)` `4FeCr_(2) O_(4) + 8Na_(2) CO_(3) + 7O_(2) to8Na CrO_(4) + 2Fe_(2) O_(3) + 8CO_(2)` `(A)"" (B )` `Na_(2) CrO_(4)+ H_(2) SO_(4) to Na_(2) Cr_(2) O_(7) + Na_(2) SO_(4) + H_(2) O` |
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| 89295. |
(A): In the smelting of copper pyrites in blast furace, Cu_(2)S formed but not FeS. (R): Ca has greater affinity to 'S than to where as fe has greater affinity to than to's |
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Answer» A and are TRUE, R explains A |
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| 89296. |
A grating has 5.7 xx 10^(3) lines per cm. If X-rays of wavelength 546 nm are incident on the grating, find the angle of reflection for the first order diffraction maximum. |
| Answer» SOLUTION :`9.95^(@)` | |
| 89297. |
(A): Graphite is an example of neutral refractory material used in furnaces (R) : Chemically graphite is most stable allotrope of carbon |
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Answer» Both A & R are TRUE, R is the CORRECT explanation of A |
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| 89298. |
(A) : In the separation of inert gases, by Dewar's method He gas does not absorbed on activated charcoal (R ) : Among noble gases helium has less atomic size The correct answer is |
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Answer» Both (A) and (R ) are TRUE and (R ) is the CORRECT EXPLANATION of (A) |
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| 89299. |
A green chromium compound (A) on fusion with alkali gives a yellow |
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Answer» SOLUTION :`A : FeCr_(2) O_(4) "" B: Na_(2)Cr_(4)"" C: Na_(2)Cr_(2) O_(7)` `4FeCr_(2) O_(4) + 8Na_(2) CO_(3) + 7O_(2) to8Na CrO_(4) + 2Fe_(2) O_(3) + 8CO_(2)` `(A)"" (B )` `Na_(2) CrO_(4)+ H_(2) SO_(4) to Na_(2) Cr_(2) O_(7) + Na_(2) SO_(4) + H_(2) O` |
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| 89300. |
(a) In the preparation of p - bromo acetanlllde from acetanilide. (i) Name the regents used . (ii) Write the equation for the reaction involved . (iii) What is the colour of the product obtained . |
Answer» Solution :(i) Bromine glacial acetic acid Middle oil FRACTION is COOLED, naphthalene crystallizes. It is removed crude phenol is washed with dilute `H_(2) SO_(4)` and then treated with NAOHSOLUTION . (ii) Sodium phenate formed, in the aqueous layer is separdted, acidified lo REGENERATE (get) phenol. `C_(6)H_(5)OH+NaOH rarrC_(6)H_(5)ONa+H_(2)O` `C_(6)H_(6)ONa+HCI rarr C_(6)H_(5)OH+NaCI` ( For acidification `CO_(2)` or `H_(2)SO_(4)` can be used ) (III) Orange. |
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