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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.
| 8301. |
A strong acid is almost completely ionized in its aqueous solution. |
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| 8302. |
A stripof a metalX is immersedin theaqueoussolutionof saltYSO_(4)bluein colour. Aftersometimes, a layerof metalY fromthe saltsolutionis depositedon thestrip of the metalx. The metal x isusedforgalvansiation, themetalY isemployedin makingelectriccables . Whatis thenatureof thechemicalreactiontakingplace? |
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Answer» Solution :It is anexampleof metaldisplacementreaction.ZnliesaboveCu in thetheactivityseriesand hastherefore, displacedCu FROMTHE blueCuSOsolution . `Zn_((s))+cuSO_(4(AQ)) to ZnSO_(4(aq))+Cu_((s))(X)` |
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| 8303. |
A stripof a metalX is immersedin theaqueoussolutionof saltYSO_(4)bluein colour. Aftersometimes, a layerof metalY fromthe saltsolutionis depositedon thestrip of the metalx. The metal x isusedforgalvansiation, themetalY isemployedin makingelectriccables . Can you name the saltsolution ? |
| Answer» SOLUTION :The SALTIS `CUSO_(4)` | |
| 8304. |
A stripof a metalX is immersedin theaqueoussolutionof saltYSO_(4)bluein colour. Aftersometimes, a layerof metalY fromthe saltsolutionis depositedon thestrip of the metalx. The metal x isusedforgalvansiation, themetalY isemployedin makingelectriccables . whatcouldbe themetalY ? |
| Answer» SOLUTION :METALY ISCU. | |
| 8305. |
A stripof a metalX is immersedin theaqueoussolutionof saltYSO_(4)bluein colour. Aftersometimes, a layerof metalY fromthe saltsolutionis depositedon thestrip of the metalx. The metal x isusedforgalvansiation, themetalY isemployedin makingelectriccables . Presictthe metalx. |
| Answer» SOLUTION :THEMETAL X is ZN | |
| 8306. |
A storekeeper was going to store a solution of copper sulphate in an aluminium container. But the class teacher stopped him. Why ? |
| Answer» Solution :Because the teacher KNEW that aluminium is more REACTIVE than copper . HENCE, aluminium can displace copper from the copper sulphate FORMING aluminium sulphate. This would CORRODE the container. | |
| 8307. |
(a) State the reason for addition of caustic alkali to bauxite ore during purification of bauxite. (b) Along with cryolite and alumina, another substance is added to the electrolyte mixture. Name the substance and give one reason for the addition. |
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Answer» Solution :(a) Naturally, Bauxite is not soluble in normal SOLVENTS. Therefore ADDITION of caustic alkali to bauxite plays an important role while extraction of aluminium. Caustic alkali dissolves bauxite forming soluble sodium meta aluminate while impurities REMAINS insoluble and precipitate as red mud. `underset(("Bauxite"))(Al_(2)O_(3)*2H_(2)O) + 2NAOH to underset(("sodium meta aluminate"))(2NaAlO_(2) + 3H_(2)O)` (b) Along with cryolite and alumina, another substance is added to the electrolyte mixture of Fluorspar. Adding of fluorspar lowers the fusion TEMPERATURE of electrolyte. |
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| 8308. |
a) State the principle of an electric generator b) Write the difference between direct current and alternating current. |
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Answer» SOLUTION :a) An electric generation is based on the PRINCIPLE of electromagnetic induction when a rectangular coil is rotated in a UNIFORM MAGNETIC field, an INDUCED voltage is generated between the ends of the coil. b) Direct current : * Its magnitude is constant and flows in one direction only. * The frequency of DC is zero Alternating current:* Its magnitude and direction reserves periodically. * The frequency of AC is finite. |
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| 8309. |
(a) State the periodic law on which Mendeleev's periodic table was based. Why and how was this periodic law changed? (b) Explain why, the noble gases are placed in a separate group. |
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| 8310. |
How does the electronic configuration of an atom of an element related to its position in the modern periodic table ? Explain with one example. |
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Answer» Solution :"Properties of clements are the periodic fiunction of their atomic NUMBER The position of elements depend upon number of valence electrons which depend upon clectronic configuration those clements wich have same valenee elcctrons occupy same group. Those elements which have one vaience electrons belong to group I elements, which have two valence clectrons belong to group 2. Period numbers is cqual to the number of SHELL. Example atonic number of sodium (Na) is 1, so electronic conf+guration will be 2.8,1. Sodium has one valence ELECTRON in vaience shell so it belong to GROUP1 as sodium has three shells, so it belong to 3RD period. |
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| 8311. |
(a) State Mendeleev's periodic law. What chemical properties of elements were used by Mendeleev in creating his periodic table? (c) State any three limitations of Mendeleev's classification of elements. (d) Besides gallium, which two other elements have since been discovered for which Mendeleev had left gaps in the periodic table? (e) Which group of elements was missing from Mendeleev's original periodic table? |
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| 8312. |
(a) State modern periodic law. (b) How does the electronic configuration of the atom of a element relate to its position in the modern periodic table? (c) How could the modern periodic law remove various anomalies of Mendeleev's periodic table? Explain with examples. (d)Is it possible to have an element having atomic number 1.5 placed between hydrogen and helium? (e) Name the scientist who prepared modern periodic table. |
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| 8313. |
(a) Why did Mendeleev have gaps in his periodic table ? (b) State any three limitations of Mendeleev's classification ? (c) How does electronic configurations of atoms change in a period with increase in atomic number? |
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Answer» Solution :a) Mendeleev.s PERIODIC LAW states that "the physical and chemical properties of all elements are the periodic function of their atomic masses"". b) Gaps were left for undiscovered element in the Mendeleev.s periodic table. c).i) POSITION of hydrogen was not justified ii) Increasing order of atomic mass could not be maintained III) Isotopes have SIMILAR chemical properties but different atomic masses, they cannot be given separate places. d) Number of shells remain the same, number of valence electrons goes on increasing from left to right in a period till octet is complete. 
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| 8314. |
(a) State in brief the functions of the following organs in the human female reproductive system: Ovary, Fallopian tube. (b) What is menstruation? Why does it occur? |
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Answer» Solution :Funtion of follopion tube : (i) Producation of female gamete. (ii) Producation of female hormone Function of follopian tube: (i) Site of fertilization (ii) Transfer of female gamets from OVARY Function of UTERUS: (i) Iinplantation of zygote fertilizes the egg. (ii) Nourishment to the developing embryo Menstruation : It is the periodic breakdown of uterine lining and it is removed along with blood & mucous in human female uterine lining is required to nourish the embryo that is FORMED if fertilization takes PLACE. In absence of fertilization the lining is not requirea and HENCE is shed in the from of menstruation. |
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| 8315. |
(a) State any three physical properties of carbon compounds. (b) Carbon is a versatile element. Justify this medium statement. |
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Answer» Solution :(a) Three physical PROPERTIES of carbon compounds are: (i) Catenation property. (ii) LOW melting and boiling point compared to ionic compound. (iii) Poor conductors of electricity. (b) Carbon is a versatile element because it forms COVALENT BONDS with large number of elements and has catenation capacity to form compounds by chain of bonds with itself. |
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| 8316. |
(a). State any three differences between the physical properties of metals and non-metals. (b). Differentiate between metals and non-metals on the basis of their chemical properties. (c). State three reasons (of which at least one must be chemical) for believing that sodium is a metal. (d). State three reasons (of which at least one must be chemical) for believing that sulphur is a non-metal. (e). Which non-metal has been placed int he reactivity series of metals. |
Answer» SOLUTION :a) The differences in Physical PROPERTIES of Metal & Non-metals  c) Sodium is a metal because it is solid, conducts electricity, forms basic oxides. d) SULPHUR is a non-metal because it is Brittle, non-ductile, Non-conductor of electricity, forms ACIDIC oxides e) Hydrogen |
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| 8317. |
A spherical orbital has three nodal regions and it contains a pair ofelectrons. If this is the only orbital that is occupied with electrons in that main energy level, and the penultimate shell is completely filled, calculate its atomic number |
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Answer» SOLUTION :`lambda =h/mv` GIVEN that `v=5.46xx10^7 cm^(s-1)` `h=6.625 xx 10^(-27) ` erg.s `m=9.1 xx 10^(-28G)`G ` therefore lambda =(6.625 xx 10^(-27))/(9.1 xx 10^(-28) xx 5.46 xx 10^7)` `=0.1333 xx 10^(-6) cm ` `lambda = 13.3 Å 0` |
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| 8319. |
A solution whichhas more ofsolutethan thesaturatedsolutionat a giventemperatureis called………. Solution . |
| Answer» SOLUTION :SUPER SATURATED | |
| 8320. |
A solution was prepared by dissolving 25 g of sugar in 100 g of water. Calculate the mass percentage of solute. |
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Answer» Solution :Massof the SOLUTE = 25g Mass of thesolvent= 100 G Mass percentage = `( " Massof the solute")/("Mass of the solution ") xx 100` Masspercentage=`( " Mass of thesolute ")/("Mass of the soluteof thesolvent ")xx 100` `=(25 )/( 25+100 ) xx 100 =(25)/( 125 ) xx 100= 20 %` |
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| 8321. |
A solution turns blue litmus red. Its pH will be : |
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Answer» 3 |
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| 8322. |
A solution turns methyl orange red. It can turn the universal indicator to _____ |
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Answer» violet |
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| 8323. |
A solution turns red litmus blue, its pH is likely to be |
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Answer» 4 |
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| 8324. |
A solution turns blue litmus red. The pH of the solution is probably. |
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Answer» 8 |
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| 8325. |
A solution showed pH 9. This solution is: |
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Answer» STRONGLY acidic |
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| 8326. |
A solution reacts with crushed egg-shells to give a gas that turns lime-water milky. The solution contains |
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Answer» NaCl |
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| 8327. |
A solution reacts with crushed egg-shells to give a gas that turns lime-water milky. The solution contains |
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Answer» NACL |
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| 8328. |
A solution of sodium chloride will turn |
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Answer» red litmus blue |
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| 8329. |
A solution of sodium carbonate in water is |
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Answer» ACIDIC |
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| 8330. |
A solution of silver nitrate (AgNO_(3))is not used as electrolyte for the electrodeposition of silver on an object . Give reason . |
| Answer» SOLUTION :Because `AgNO_(3) to Ag^(+) +e^(-)` is a strong ELECTROLYTE .Therefore ,discharge of `Ag^(+)` IONS and DEPOSITIONS of silver will be rapid . Thus , the layer of silver coating on the surface of the object will not be uniform . | |
| 8332. |
A solution of hydrochloric acid is dropped on baking soda. The gas evolved is |
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Answer» SULPHUR DIOXIDE |
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| 8333. |
A solution of a substance X is used for whitewashing. (1) Name the substance .X. and write its formula. (2) Write the reaction of the substance X named in (1) above with water. |
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Answer» Solution :(1) Substance X is calcium oxide. Its FORMULA is CaO. (2) Calcium oxide reacts vigorously with water and forms slaked lime (`Ca(OH)_(2)`) and liberates large AMOUNT of heat. It is an exothermic reaction. `CaO(s) + H_(2)O(1) to Ca(OH)(2)(aq) + "Heat"` |
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| 8334. |
A solution of a substance 'X' is used for whitewashing. (i) Name the substance 'X' and write its formula. (ii) Write the reaction of the substance 'X' named in (i) above with water. |
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Answer» Solution :(i) The substance .X. and write its formula. (ii) Write the reaction of the substance .X. NAMED in (i) above with water. (ii) When quick LIME is mixed with water, the following reaction takes place: `underset(("Calcium oxide"))underset("Quick lime")(CAO(s))+underset("Water")(H_(2)O)(l)rarrunderset(("Slaked lime"))underset("Calcium hydroxide")(Ca(OH)_(2)(aq))+"Heat"` |
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| 8335. |
A solution of a substance 'X' is used in whitewashing. (i) Name the substance 'X' and write its formula. (ii) Write the reaction of the substance 'X' named in (i) above with water |
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Answer» SOLUTION :(i) The substance .X. is quick lime (calcium oxide) and itsformula is CaO. (ii) `underset (("Quick lime"))(CaO)+underset(("Water"))(H_(2)O)rarrunderset(("SLAKED lime"))(Ca(OH)_(2))+"Heat"` |
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| 8336. |
A solution of a substance 'X' is used for white washing. eaction of the substance 'X' named in (i) above with water. |
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Answer» SOLUTION :CALCIUM oxide reacts with WATER as under : `underset("Calcium oxide")(CaO(s))+underset("Water")(H_(2)O(l))tounderset("Calcium hydroxide")(CA(OH)_(2)(AQ))` |
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| 8337. |
A solution of a substance 'X' is used for white washing. bstance 'X' and write its formula. |
| Answer» Solution :Substance .X. used for WHITE washing is CALCIUM OXIDE (or QUICK lime). Its FORMULA is CaO. | |
| 8338. |
A solution of a substance 'X' is used for testing carbon dioxide. What will be the reaction of 'X' with carbon dioxide ? Write balanced equation for this reaction. |
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Answer» Solution :.X. is CALCIUM hydroxide or slaked lime. .X. reacts with carbon DIOXIDE to form calcium carbonate which appears as a white precipitate. The balanced equation for this REACTION is : `underset("Precipitate")(Ca(OH)_(2)(AQ)+CO_(2)(g)toCaCO_(3)(s)+H_(2)O(l))` |
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| 8339. |
A solution makes red litmus blue. The pH of the solution is |
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Answer» LESS than 7 |
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| 8340. |
A solution is prepared by dissolving 45 g of sugar in 180 g of water. Calculate the mass percentage of solute. |
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Answer» Solution :Massof SUGAR= 45 g Massof WATER( solvent ) = 180g Masspercentage `=("Massof thesolute ")/(" Mass ofthe SOLUTE+ Massof thesolvent ")xx100` `=(45)/(45+180) xx 100 = ( 45)/(225 ) xx 100` `=20 %` |
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| 8341. |
A solution is prepared by adding 2 g of a substance A to 18 g of water. Calculate the massper cent of the solute. |
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| 8342. |
A solution is a .................. mixture of two or more substances. |
| Answer» SOLUTION :HOMOGENEOUS | |
| 8343. |
A solution is a ................... mixture. |
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Answer» HOMOGENEOUS |
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| 8344. |
A solution is a heterogeneous mixture of two or more substances. |
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| 8345. |
A solution in which no more solute can be dissolved in a definite amount of solvent at a given temperature is called ………. |
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Answer» SATURATED SOLUTION |
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| 8347. |
A solution has a pH of 7. Tell how would you decrease its pH. |
| Answer» SOLUTION :By ADDING ACID | |
| 8348. |
A solution contains magnesium ions (Mg^(2+)) , iron (II) ,ions (Fe^(2+)) and copper ions (Cu^(2+)) .On passing an elctric curent through this soolution , which ions will be the first to be discharged at the cathode ? Write the equation for the cathode reaction . |
| Answer» SOLUTION :`CU^(2+) + 2E^(-) to Cu` | |
| 8349. |
A solution contains four components, it is called as a binary solution. |
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| 8350. |
A solid substance P which is very hard is used in the construction of many buildings epiecialy flooring When substance P is heated strongly, it decompose to from another soolid Q and a gas R is given our Solid Q reacts with water with the releade of a lot of heat to from a substance S. When gas R is passed into a clear solutio of substance S, then a while precipitate of substance T is formed. The substance T has the same chemical composition as starting substance P. (a) What is substance P? Write its common name as well as chemical formula. (b) What is substance Q? (c ) What is gas R? (d) What is substance S ? What is its clear solution known as ? (e) What is substance T ? Name any two natural forms in which substance T occurs in nature |
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