94420 + Interview Questions in Chemistry in Class 12

1.	Assertion. Cu, Ag and Au lie in Group IIof the periodic table. Hence, their atomci radii are in the order Cu lt Ag lt Au Reason . In any groupof transition elements,the atomicradii increaseas we move down the group.
Answer» Solution :Correct A. The atomic RADII are in the order `:` `CU lt AG ~= AU`. Correct R. Ag and Au have same atomic radii due to the EFFECT of lanthanoide contraction.

Discussion

2.	Assertion: Bromobenzene, upon reaction with Br_(2)//Fe gives 1,4-dibromobenzene as the major product. Reason: In bromobenzene, the inductive effect of the bromo group is more dominant than the mesomeric effect in directing the incoming electrophile.
Answer» If both assertion and REASON are correct and reason is correct explanation for assertion If both assertion and reason are correct but reason is not correct explanation for assertion. If assertion is correct but reason is incorrect. if both assertion and reason are incorrect. Solution :Correct reason: in BROMOBENZENE, the mesomeric EFFECT is more dominant that the inductive effect in directing the incoming ELECTROPHILE.

Discussion

3.	Assertion: CsI is sparingly soluble inwater Reason: Hydration energy Cs^(+) and I^(-) ions are higher than lattice energy.
Answer» If both ASSERTION and reason are true and the reason is the correct EXPLANATION of assertion If both assertion and reason are true and the reason is not the correct explanation of assertion If assertion is FALSE but reason is true If assertion is true but the reason is false Answer :C

Discussion

4.	Assertion : Buna-S is a copolymer . Reason : Buna-S is formed by condensationreaction between two different monomers.
Answer» If both ASSERTION and reason are trueand reason is the correct EXPLANATIONOF assertion . If both assertion and reason are true but reason is not the correct explanationof assertion . If assertion is true but reason is false. If both assertion and reason are false. Solution :Buna-S isformed by addition REACTION between two different monomerss , 1,3- butadiene and STYRENE .

Discussion

5.	Assertion : Cryolite is used in electrolytic extraction of Al from alumina. It dissolves alumina.
Answer» If both ASSETION and reason are CORRECT, and reason is the CORRECT explanation of the ASSERTION If both assertion and reason are CORRECT, but reason is NOT the CORRECT explanation of the assertion If assertion is CORRECT but reason is INCORRECT If assertion is INCORRECT but reason is CORRECT Answer :A

Discussion

6.	Assertion : Breeder reactor produces ._(94)Pu^(239) fissile from non-fissile uranium. Reaosn : A breeder reactor is one that produces more fissionable nuclei than it consumes
Answer» If both assertion and REASON are true and the reason is the CORRECT explanation of the assertion If both assertion and reason are true but reason is not the correct explanantion of the assertion If assertion is true but reason is false If the assertion and reason both are false Solution :`._(92)U^(238) + ._(0)n^(1) rarr ._(92)U^(239) overset(-BETA)rarr ._(93)Np^(239) overset(-beta)rarr ._(94)PU^(239)` In breeder reactors, the neutrons produced from fission of `U - 235` are partly used to carry on the fission of `U - 235` and partly used to produce some other fissionable material.

Discussion

7.	Assertion: Cross Cannizzaro reaction between formaldehyde and benzaldehyde gives benzyl alcohol and formate ion. Reason: Formaldehyde is a better hydride donor than benzaldehyde.
Answer» if both ASSERTION and RESON are TRUE, and REASON is the true EXPLANATION of the assertion. If both assertion and reason are true, but reason is not the true explanation of the assertion. if assertion is true, but reason is false. If both assertion and reason are false. Answer :A

Discussion

8.	Assertion: Br^(-) ions do not interfere in the chromyl chloride test forr chlorides. Reason: A bromide, on oxidation with K_(2)Cr_(2)O_(7)//concentrated H_(2)SO_(4), liberates Br_(2), which dissolves in NaOH to give a colourless solution.
Answer» If assertion is TRUE but the reason is FALSE If assertion is false but reason is true If both assertion and reason are true and reason is the CORRECT explanation of assertion If oth assertion and reason are true but reason is not the correct explanation of assertion Answer :C

Discussion

9.	Assertion : Cross aldol condensation of ethanal and propanal gives a mixture of four products. Reason : Ethanal and propanal, both contain alpha- hydrogen atom.
Answer» If both ASSERTION and reason are true and reason is the CORRECT EXPLANATION of assertion. If both assertion and reason are true but reason is not the correct explanation of assertion. If assertion is true but reason is false. If both assertion and reason are false. Answer :A

Discussion

10.	Assertion: Both rhombic and monollinic sulphur exist as S_(8) but oxygen exist as O_(2). Reason: Oxygen forms P_(π)–P_(π) multiple bond due to small size and small bond length but P_(π)–P_(π) bonding is not possible is sulphur.
Answer» Both assertion and REASON are correct STATEMENTS, and reason is the correct explanation of the assertion. Both assertion and reason are correct statements, but reason is not the correct explanation of the assertion. Assertion is correct, but reason is wrong statement. Assertion is wrong but reason is correct statement. ANSWER :A

Discussion

11.	Assertion: CrO_(3) reacts with HCl to form chromyl chloride gas. Reason: Chromyl chloride(CrO_(2)Cl_(2)) has tetrahedral shape.
Answer» If both assertion and reason are TRUE and the reason is the CORRECT EXPLANATION of assertion If both assertion and reason are true and the reason is not the correct explanation of assertion If assertion is FALSE but reason is true If assertion is true but the reason is false ANSWER :B

Discussion

12.	Assertion :Br^(Θ) ions do not interfere in thechromyl chloride test for chloorides Reasion : A bromide on oxidationwith K_(2)Cr_(2)O_(7) concentrates H_(2)SO_(4) liberates Br_(2) whichdissolve in NaOH to give a colourless solution
Answer» If both (A) and (B) are CORRECT and (R ) is the correct explqanation of (A) If both (A) and (B) are correct but (R ) is not the correct explqanation of (A) If (A) is correct ,but (R ) is INCORRECT If (A) is incorrect ,but (R ) is correct Answer :a

Discussion

13.	Assertion: Crystalline solids have short range order. Reason: Amorphous solids have long range order.
Answer» If both ASSERTION and reason are true and the reason is the correct explanantion of the assertion If both assertion and reason are true but reason is not the correct EXPLANATION of the assertion. If assertion is true but reason is FALSE. If assertion is false but reason is true. Solution :Crystalline solids have regular arrangement of constituent particles and are ANISOTROPIC whereas amorphous solids have no regular arrangement and are isotropic.

Discussion

14.	Assertion : Both rhombic and monoclinic sulphur exist as S_8 but oxygen exists as O_(2) . Reason : Oxygen forms pn - pn multiple bond due to small size and small bond length but p pi - p pibonding is not possible in sulphur.
Answer» Both assertion and REASON are correct STATEMENTS, and reason is the correct EXPLANATION of the assertion. Both assertion and reason are correct statements, but reason is not the correct explanation of the assertion. Assertion is correct, but reason is WRONG statement. Assertion is wrong but reason is correct statement. Solution :Both assertion and reason are correct statements, and reason is the correct explanation of the assertion.

Discussion

15.	Assertion : [Cr(H_(2)O)_(6)]Cl_(2) and [Fe(H_(2)O)_(6)]Cl_(2) are reducing in nature. Reason : Unpaired electrons are present in their d-orbitals.
Answer» SOLUTION :Correct EXPLANATION. Cr is present as `Cr^(2+)` which can undergo oxidation to `Cr^(3+)` and Fe is present as `Fe^(2+)` which can undergo oxidation to `Fe^(3+)` (`H_(2)O` is a weak ligand in both).

Discussion

16.	Assertion : Both rhombic and monoclinic sulphur exist as S_(8) but oxygen exists as O_(2). Reason : Oxygen forms p pi - p pi multiple bond due to small size and small bond length but p pi - p pi bonding is not possible in sulphur.
Answer» Both assertion and REASON are correct STATEMENTS, and reason is the correct explanation of the assertion. Both assertion and reason are correct statements, but reason is not the correct explanation of the assertion. Assertion is correct, but reason is WRONG STATEMENT. Both assertion and reason are wrong statement. SOLUTION :Reason is the correct explanation of assertion.

Discussion

17.	Assertion :[Cr(H_(2)O)_(2)]^(-2)to[Cr(H_(2)O)_(6)]^(+2) while converthing, colour continuoulsy changes. Reason: CFSE is increases during change.
Answer» If both assertion and reason are true and reason is the correct explanation of assertion. If both assertion and reason are true but reason is not the correct explanation of assertion. If assertion is true but reason is false. If both assertion and reason are false. Solution :OXIDATION stathe of Cr in `[Cr (H_(2)O)_(6)]^(2+)` is +2 Electronic configuratio of `Cr=(Ar) _(18)4S^(1)3d^(2)` Electronic condiguration of `Cr^(2+)=(Ar)_(16)3d^(4)` `H_(2)O` is W & F ligand CFSE value `=[-o 4 n_(zg)+0.6 n_(eg)]Delta_(o)+nP` `=[-0.4xx3+0.6x1]Delta_(0)+0` `=-0.6 Delta_(0)` Oxidation state of Cr in `[Cr(H_(2)O)_(6)]^(3+)is +3` CFSE value of `(Cr(H_(2)O)_(6)]^(3+)=[-0.4""^(n+)2g+0.6n_(eg)]Delta_(0)+nP` `=[-0.4xx3+0]Delta_(0)+0` `=-1.2Delta_(0)` CFSE does not EFFECT colour rether `Delta_(0)` value can change colour.

Discussion

18.	Assertion. Both [Ni(CN)_(4)]^(2-) and [NiCl_(4)]^(2-) have same shape and same magnetic behaviour. Reason. Both are square planar and diamagnetic.
Answer» If both assertion and reason are true, but reason is not the true EXPLANATION of the assertion If both assertion and reason are true, but reason is not the true explanation of the assertion If assertionis true, but reason is false If both assertion and reason are false Solution :Correct A. `[NI(CN)_(4)]^(2-)` is square planar and diamagnetic WHEREAS `[NiCl_(4)]^(2-)` is TETRAHEDRAL and PARAMAGNETIC. Correct R. `[Ni(CN)_(4)]^(2-)` is tetrahedral.

Discussion

19.	Assertion : Cr_(2) O_(7)^(2-) becomesequilibriumwith CrO_(4) ^(2-) at pH gt 5 Reason: Cr_(2) O_(7) ^(2-)istetrahedralhavingCr-O- Crangle109^(@)28
Answer» bothassertionand reasonare truereasonis thecorrectexplanationof THEASSERTION . bothassertinandreasonare truebutreasonis notcorrectexplanationof theassertion Assertionis truebutreasonis FALSE Bothassertionand reasonare false. Answer :D

Discussion

20.	Assertion: Both Grignard reagent and dialkylcadmium react with acid chlorides to form tert-alcohols. Reason: Grignard reagents are as reactive as dialkylcadmium.
Answer» if both assertion and reson are true, and reason is the true explanation of the assertion. If both assertion and reason are true, but reason is not the true explanation of the assertion. if assertion is true, but reason is false. If both assertion and reason are false. Solution :Correct assertion: GRIGNARD reagents react with acid CHLORIDES to give tert-alcohols but dialkylcadmium GIVES ketones. Correct reason. Grignard reagents are more reactive than dialkylcadmium.

Discussion

21.	Assertion : Cougulation power of Al^(3+) in more than Na^(+) Reason : Greater the valency of the flocculating ion added , greater is its power to cause precipitaion
Answer» if both ASSERTION and reason are TRUE and reason is the CORRECT explanation of assertion if both assertion and reason are true but reason is not the correct explanation of assertion assertion is true but reason is false both assertion and reason are false. Answer :A

Discussion

22.	Assertion. Both C and CO can reduce FeOto Fe but at temperaturesabove 1073 K it isC whichisabetterreducingagentthan COwhile below1073 K,itisCOwhich isa betterreducingagentthan C. Reason. Above 1073 K,Delta _f G^(@) for COfrom C is morenegativethan that of FeOfrom Fe while below1073 K,Delta _f G^(@)CO_ 2from COis more negativethat thatof FeOfrom Fe.
Answer» Ifbothassertionandreasonaretrue, ANDREASON is NOTTHE trueexplanationofthe ASSERTION. Ifbothassertionandreasonaretrue,butreasonis notthetrueexplanationoftheassertion. Ifassertionis TRUE,butreason isfalse If bothassertionandreasonarefalse ANSWER :A

Discussion

23.	Assertion : Both Buna-N and Buna-S have buta-1, 3- diene monomers. Reason : Both are polyamides.
Answer» Assertion and reason both are CORRECT statements and reason is correct explanation for assertion. Assertion and reason both are correct statements but reason is not correct explanation for assertion. Assertion is correct STATEMENT but reason is WRONG statement. Assertion is wrong statement but reason is correct statement. Answer :C

Discussion

24.	Assertion: Copper sulphate solution can be kept in a zinc vessel. Reason: The position of copper is higher than zinc is the electrochemical series.
Answer» If both ASSERTION and reason are TRUE, and reason is the true explanation of the assertion if both assertion and reason are true, but reason is not the true explanation of the assertion. if assertion is true, but reason is false. If both assertion and reason are false. Solution :Correct A. copper SULPHATE solution cannot be kept inzinc VESSEL. ltBrgt Correct R. The POSITION of zinc is higher than copper in the electrochemical series.

Discussion

25.	Assertion: Both formic acid and oxalic aciid decolourize KMnO_(4) solution. Reason: Both are easily oxidised to CO_(2) and H_(2)O.
Answer» If both assertion and reason are TRUE and the reason is the correct EXPLANATION of the assertion. If both assertion and reason are true but reason is not the correct explanation of the assertion If assertion is true but reason is false. If the assertioin and reason both are false. Solution :Both FORMIC acid and oxalic acid behave as REDUCING agent and decolourise acidified `KMnO_(4)` solution. `2KMnO_(4)+3H_(2)SO_(4)toK_(2)SO_(4)+2MnSO_(4)+3H_(2)O+5[O]`.

Discussion

26.	Assertion: Copper sulphate can be stored in zinc vessel. Reason: Zinc is less reactive than copper.
Answer» Both ASSERTION and reason are true and the reason is the CORRECT explanation of assertion. Both assertion and reason are true and the reason is not the correct explanation of assertion. Assertion is true but the reason is false. Both assertion and reason are false. Solution :Correct Assertion. Copper SULPHATE solution cannot be stored in ZINC VESSEL. Correct Reason. Zinc is more reactive than copper.

Discussion

27.	Assertion. Both 106 g of sodium carbonate and 12 g of carbon have same number of carbon atoms. Reason. Both contain 1 g atom of carbon which contains 6.023xx10^(23) carbon atoms.
Answer» If both assertion and reason are true, and reason is the true explanation of the assertion. If both assertion and reason are true, but reason is not the true explanation of the assetion. If assertion is true, but reason if false If both assertion and reason are false. Solution :`106G Na_(2)CO_(3)=1mol-=1"g atom of C"` `"12 g C = 1 g atom of C."`

Discussion

28.	Assertion : Copper sulphate can be stored in zinc vessel. Reason : Zinc is less reactive than copper.
Answer» Both ASSERTION and REASON are true and the reason is the correct EXPLANATION of assertion. Both assertion and reason are true and the reason is not the correct explanation of assertion. Assertion is true but the reason is FALSE. Both assertion and reason are false. Solution :Both assertion and reason are false.

Discussion

29.	Assertion: Boron is metalloid. Reason : Boronshows metallic nature.
Answer» If both assertion and REASON are TRUE and the reason is the correct explanation of the assertion If both assertion and reason are true but reason is nto the correct exaplation of the assertion If assertion is true but reason is false If the assertion and reason both are false Solution :Boron is METALLOID. Thus assertion is correct. Metalloids possess, METALLIC as WELL as non-metallic nature. Hence, reason is false.

Discussion

30.	Assertion : Copper sulphate can be kept in a zinc vessel Reason : The position of copper is higher than zinc in the electro chemical series
Answer» (A) and (R) are true and (R) is the CORRECT explanation of (A) Both (A) and (R) are true but (R) does not EXPLAIN (A) (A) is true but (R) is false Both (A) and (R) are false Answer :D

Discussion

31.	Assertion:- Boric acid cannot be titrated with NaOH solution. Reason:- Cupellation is the process used to remove silver impurity from Pb. Reason:- This method is used when metal is easily oxidised by air but oxidation of impurity is not possible.
Answer» If both Assertion `&` Reason are TRUE `&` the Reason is a CORRECT EXPLANATION of the Assertion. If both Assertion `&` Reason are True but Reason is not a correct explanation of the Assertion. If Assertion is True but the Reason is False. If both Assertion `&` Reason are False. ANSWER :B

Discussion

32.	Assertion Copper rod turns colourless solution of zinc sulphate to light blue. Reason Zinc reduces copper (III) ions to Cu.
Answer» Both A and R are TRUE and R is the CORRECT EXPLANATION of A Both A and R are true but R is not a correct explanation of A A is true but R is false Both A and R arefalse. Answer :D

Discussion

33.	Assertion : Boric acid is weak monobasic acid. Reason : Boric acid gives one H^(+) ion.
Answer» Both assertion and REASON are TRUE and the reason is the correct explanation of the assertion. Both the assertion and reason are true but the reason is not the correct explanation of the assertion. Assertion is true but reason is FALSE. Both assertion and reason are false. Answer :C

Discussion

34.	Assertion: Copper reacts with hydrochloric and liberates hydrogen from the solution of dilute hydrochloric acid. Reason: Hydrogen is below copper in the electrochemical.
Answer» if both assertion and reason are true and the reason is the correct explanation of the assertion. If both assertion and reason are true but reason is not the correct explanation of the assertion. If assertion is true but reason is FALSE If the assertion and reason both are false. Solution :COPPER is present below hydrogen therefore hydrogen from HCl canot be LIBERATED by TREATING with copper. Hence assertion and reason both false.

Discussion

35.	Assertion: Borax bead test is applicable only to formation of transition metal salt Reaction: In borax bead test, coloured salts are decomposed to give coloured metal meta borates.
Answer» STATEMENT-1 is true, statement-2 is true and statement -2 is CORRECT EXPLANATION for statement-1 Statement -1 is true, statement -2 is true and statement-2 is NOT the correct explanation for statement -1 Statement -1 is true- statement-2 is FALSE. Statement- 1 is false, statement -2 is true. Answer :A

Discussion

36.	Assertion : Copper metal gets readily corroded in an acidic aqueous solution. Reason : Free energy change for this process is positive.
Answer» If both assertion and REASON are true and the reason is not thecorrect explanation of the assertion. If both assertion and reason are true but reason is not the correct explanation of the assertion. If assertion is true but reason is false. It the assertion and reason both are false. Solution :Copper corrodes at negligible rates in unpolluted AIR, water and deaerated non-oxidiing acids. Pure copper and the high copper alloys can be considered to exhibit similar resistance to most corrosive ENVIRONMENTS. They POSSES excellent resistance to atmospheric environments. Corrosion is a spontaneous process for which free energy change must be negative.

Discussion

37.	Assertion: Bond energy has order like C-C lt C=C lt C -= C. Reason: Bond energy increases with increase in bond order.
Answer» If both assertion and reason are true and the reason is the correct explanation of the assertion if both assertion and reason are true but reason is not the correct explanation of the assertion if assertion is true but reason is FALSE if the assertionand reason both are false SOLUTION :With increases in bond order, bond LENGTH decreases & hence bond energy increases so both assertion & reason are true & reason are the correct explanation of assertion.

Discussion

38.	Assertion: Copper liberates hydrogen from a dilute solution of hydrochloric acid. Reason: Hydrogen is below copper in the electrochemical series.
Answer» If both assertion and reason are TRUE, and reason is the true explanation of the assertion if both assertion and reason are true, but reason is not the true explanation of the assertion. if assertion is true, but reason is false. If both assertion and reason are false. Solution :Correct A. Copper does not liberate hydrogen from DILUTE hydrochloric ACID solution. Correct R. Copper is below hydrogen in the electrochemical series.

Discussion

39.	Assertion : bond dissociation energy of N-F bond in NF_(3) molecule is lower than that of in NCl_(3) molecule. Reason : Interelectronic repulsion exists between small size N and F atoms N-F bond of NF_(2) molecule.
Answer» If ASSERTION is TRUE but the REASON is false If assertion is false but reason is true If both assertion and reason are true and the reason is the correct EXPLANATION of assertion If both assertion and reason are true and the reason is not the correct explanation of assertion Answer :B

Discussion

40.	Assertion : Copper does not get corroded in the acidic medium. Reason : Free energy for this process is positive.
Answer» If both ASSERTION and REASON are CORRECT and reason is correct EXPLANATION for assertion. If both assertion and reason are correct but reason is not correct explanation for assertion. If assertion is correct but reason is INCORRECT. If assertion and reason both are incorrect. Solution :(a) Reason is the correct explanation for assertion.

Discussion

41.	Assertion : bond dissociation energy of N-F bond in NF_(3) molecule is lower than that of in NCl_(3) molecule. Reason : Interelectronic repulsion exists between small size N and F atoms N-F bond of NF_(3) molecule.
Answer» If ASSERTION is TRUE but the reason is FALSE If assertion is false but reason is true If both assertion and reason are true and the reason is the correct explanation of assertion If both assertion and reason are true and the reason is not the correct explanation of assertion Answer :B

Discussion

42.	Assertion. Cooking time is reduced in pressure cooker. Reason. Boiling point inside the pressure cooker is raised.
Answer» If both ASSERTION and reason are TRUE, and reason is the true EXPLANATION of the assertion. If both assertion and reason are true, but reason is not the true explanation of the assertion. If assertion is true, but reason is false. If both assertion and reason are false. Solution :R is the CORRECT explanation of A.

Discussion

43.	Assertion: bond dissociation energy of N-F bond in NF_(3) molecule in lower than that of in NCl_(3) molecule. Reason: Inter electronic repulsion exists between small size N and F atoms in N-F bond of NF_(3) molecule.
Answer» If both (A) and (R) are true and (R) is the CORRECT explanation of (A) if both (A) and (R) are true but (R) is not correct explanation of (A) If (A) is true but (R) is false If (A) is false but (R) is false Answer :D

Discussion

44.	Assertion : Cooking time is reduced in pressure cooker. Reason : Boiling point of water inside the pressure cooker is lowered.
Answer» If both assertion are REASON are correct and reason is correct explanation for assertion. If both assertion and reason are corrct but reason is not correct explanation for assertion. If assertion is corrct but reason is incorrect. If assertion and reason both are incrrect. Solution :Correct Reason. BOILING POINT of water inside the pressure cooker GETS raiseds when pressure is increased.

Discussion

45.	Assertion : bond dissociation energy of fluorine is greater than chlorine gas. Reason:chlorine has more electronic repulsion than fluorine.
Answer» Both ASSERTION and REASON are TRUE and reason is the CORRECT explanation of assertion. Both assertion and reason are true but reason is not the correct explanation of assertion. Assertion is true but reason are false. Both assertion and reason are false. Solution :Both assertion and reason are false.

Discussion

46.	AssertionConsider the following two bromides I and II undergoing solvolysisreaction in boilding ethanol : I isless reactive than IIin the given solvolysis reaction. ReasonThe resonance stabillsation available with intermediate formed II is the important driving force.
Answer» Both assertion and REASON are connect and reason is the correct EXPLANATION of the assertion. Both assertion and reason are correct but reason is not the correct EXPLANTATION of assertion. Assertion is correct but reason is INCORRECT Assertion is incorrect but reason is correct. Answer :A

Discussion

47.	Assertion : bonddissociation energy of fluorineis greater than chlorine gas. Reason : chlorine has more electronicrepulsion than fluorine.
Answer» Both ASSERTION and reason are true and reason is the correct EXPLANATION of assertion. Both assertion and reason are true but reason is not the correct explanation of assertion . Assertion is true but reason is false Both assertion and reason are false. Answer :A::B::D

Discussion

48.	Assertion. [Co(NO_(2))_(3)(NH_(3))_(3)] does not show optical isomerism. Reason. It has a plane of symmetry.
Answer» If both assertion and reason are true, but reason is not the true EXPLANATION of the assertion If both assertion and reason are true, but reason is not the true explanation of the assertion If assertionis true, but reason is false If both assertion and reason are false Solution :R is the correct explanation of A.

Discussion

49.	Assertion: Bond angle in ethers is slightly less than the tetrahedral angle. Reason: There is a repulsion between the two bulky (-R) group.
Answer» Assertion and reason both are CORRECT and reason is correct EXPLANATION of assertion. Assertion and reason both are wrong statement. Assertion is correct statement but reason is wrong statement. Assertion is wrong statement but reason is correct statement. Solution :Correct assertion. BOND angle in ethers is SLIGHTLY more than the tetrahedral angle.

Discussion

50.	Assertion :Conformers are impractical to separate. Reason :Conformers have negligibly small difference in their potential energy
Answer» Both Assertion and Reason are TRUE and Reason is the CORRECT explanation of Assertion Both Assertion and Reason are true and Reason is not the correct explanation of Assertion Assertion is true but Reason is FALSE Both Assertion and Reason are false ANSWER :A

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Assertion. Cu, Ag and Au lie in Group IIof the periodic table. Hence, their atomci radii are in the order Cu lt Ag lt Au Reason . In any groupof transition elements,the atomicradii increaseas we move down the group.

Assertion: Bromobenzene, upon reaction with Br_(2)//Fe gives 1,4-dibromobenzene as the major product. Reason: In bromobenzene, the inductive effect of the bromo group is more dominant than the mesomeric effect in directing the incoming electrophile.

Assertion: CsI is sparingly soluble inwater Reason: Hydration energy Cs^(+) and I^(-) ions are higher than lattice energy.

Assertion : Buna-S is a copolymer . Reason : Buna-S is formed by condensationreaction between two different monomers.

Assertion : Cryolite is used in electrolytic extraction of Al from alumina. It dissolves alumina.

Assertion : Breeder reactor produces ._(94)Pu^(239) fissile from non-fissile uranium. Reaosn : A breeder reactor is one that produces more fissionable nuclei than it consumes

Assertion: Cross Cannizzaro reaction between formaldehyde and benzaldehyde gives benzyl alcohol and formate ion. Reason: Formaldehyde is a better hydride donor than benzaldehyde.

Assertion: Br^(-) ions do not interfere in the chromyl chloride test forr chlorides. Reason: A bromide, on oxidation with K_(2)Cr_(2)O_(7)//concentrated H_(2)SO_(4), liberates Br_(2), which dissolves in NaOH to give a colourless solution.

Assertion : Cross aldol condensation of ethanal and propanal gives a mixture of four products. Reason : Ethanal and propanal, both contain alpha- hydrogen atom.

Assertion: Both rhombic and monollinic sulphur exist as S_(8) but oxygen exist as O_(2). Reason: Oxygen forms P_(π)–P_(π) multiple bond due to small size and small bond length but P_(π)–P_(π) bonding is not possible is sulphur.

Assertion: CrO_(3) reacts with HCl to form chromyl chloride gas. Reason: Chromyl chloride(CrO_(2)Cl_(2)) has tetrahedral shape.

Assertion :Br^(Θ) ions do not interfere in thechromyl chloride test for chloorides Reasion : A bromide on oxidationwith K_(2)Cr_(2)O_(7) concentrates H_(2)SO_(4) liberates Br_(2) whichdissolve in NaOH to give a colourless solution

Assertion: Crystalline solids have short range order. Reason: Amorphous solids have long range order.

Assertion : Both rhombic and monoclinic sulphur exist as S_8 but oxygen exists as O_(2) . Reason : Oxygen forms pn - pn multiple bond due to small size and small bond length but p pi - p pibonding is not possible in sulphur.

Assertion : [Cr(H_(2)O)_(6)]Cl_(2) and [Fe(H_(2)O)_(6)]Cl_(2) are reducing in nature. Reason : Unpaired electrons are present in their d-orbitals.

Assertion : Both rhombic and monoclinic sulphur exist as S_(8) but oxygen exists as O_(2). Reason : Oxygen forms p pi - p pi multiple bond due to small size and small bond length but p pi - p pi bonding is not possible in sulphur.

Assertion :[Cr(H_(2)O)_(2)]^(-2)to[Cr(H_(2)O)_(6)]^(+2) while converthing, colour continuoulsy changes. Reason: CFSE is increases during change.

Assertion. Both [Ni(CN)_(4)]^(2-) and [NiCl_(4)]^(2-) have same shape and same magnetic behaviour. Reason. Both are square planar and diamagnetic.

Assertion : Cr_(2) O_(7)^(2-) becomesequilibriumwith CrO_(4) ^(2-) at pH gt 5 Reason: Cr_(2) O_(7) ^(2-)istetrahedralhavingCr-O- Crangle109^(@)28

Assertion: Both Grignard reagent and dialkylcadmium react with acid chlorides to form tert-alcohols. Reason: Grignard reagents are as reactive as dialkylcadmium.

Assertion : Cougulation power of Al^(3+) in more than Na^(+) Reason : Greater the valency of the flocculating ion added , greater is its power to cause precipitaion

Assertion : Both Buna-N and Buna-S have buta-1, 3- diene monomers. Reason : Both are polyamides.

Assertion: Copper sulphate solution can be kept in a zinc vessel. Reason: The position of copper is higher than zinc is the electrochemical series.

Assertion: Both formic acid and oxalic aciid decolourize KMnO_(4) solution. Reason: Both are easily oxidised to CO_(2) and H_(2)O.

Assertion: Copper sulphate can be stored in zinc vessel. Reason: Zinc is less reactive than copper.

Assertion. Both 106 g of sodium carbonate and 12 g of carbon have same number of carbon atoms. Reason. Both contain 1 g atom of carbon which contains 6.023xx10^(23) carbon atoms.

Assertion : Copper sulphate can be stored in zinc vessel. Reason : Zinc is less reactive than copper.

Assertion: Boron is metalloid. Reason : Boronshows metallic nature.

Assertion : Copper sulphate can be kept in a zinc vessel Reason : The position of copper is higher than zinc in the electro chemical series

Assertion:- Boric acid cannot be titrated with NaOH solution. Reason:- Cupellation is the process used to remove silver impurity from Pb. Reason:- This method is used when metal is easily oxidised by air but oxidation of impurity is not possible.

Assertion Copper rod turns colourless solution of zinc sulphate to light blue. Reason Zinc reduces copper (III) ions to Cu.

Assertion : Boric acid is weak monobasic acid. Reason : Boric acid gives one H^(+) ion.

Assertion: Copper reacts with hydrochloric and liberates hydrogen from the solution of dilute hydrochloric acid. Reason: Hydrogen is below copper in the electrochemical.

Assertion: Borax bead test is applicable only to formation of transition metal salt Reaction: In borax bead test, coloured salts are decomposed to give coloured metal meta borates.

Assertion : Copper metal gets readily corroded in an acidic aqueous solution. Reason : Free energy change for this process is positive.

Assertion: Bond energy has order like C-C lt C=C lt C -= C. Reason: Bond energy increases with increase in bond order.

Assertion: Copper liberates hydrogen from a dilute solution of hydrochloric acid. Reason: Hydrogen is below copper in the electrochemical series.

Assertion : bond dissociation energy of N-F bond in NF_(3) molecule is lower than that of in NCl_(3) molecule. Reason : Interelectronic repulsion exists between small size N and F atoms N-F bond of NF_(2) molecule.

Assertion : Copper does not get corroded in the acidic medium. Reason : Free energy for this process is positive.

Assertion : bond dissociation energy of N-F bond in NF_(3) molecule is lower than that of in NCl_(3) molecule. Reason : Interelectronic repulsion exists between small size N and F atoms N-F bond of NF_(3) molecule.

Assertion. Cooking time is reduced in pressure cooker. Reason. Boiling point inside the pressure cooker is raised.

Assertion: bond dissociation energy of N-F bond in NF_(3) molecule in lower than that of in NCl_(3) molecule. Reason: Inter electronic repulsion exists between small size N and F atoms in N-F bond of NF_(3) molecule.

Assertion : Cooking time is reduced in pressure cooker. Reason : Boiling point of water inside the pressure cooker is lowered.

Assertion : bond dissociation energy of fluorine is greater than chlorine gas. Reason:chlorine has more electronic repulsion than fluorine.

AssertionConsider the following two bromides I and II undergoing solvolysisreaction in boilding ethanol : I isless reactive than IIin the given solvolysis reaction. ReasonThe resonance stabillsation available with intermediate formed II is the important driving force.

Assertion : bonddissociation energy of fluorineis greater than chlorine gas. Reason : chlorine has more electronicrepulsion than fluorine.

Assertion. [Co(NO_(2))_(3)(NH_(3))_(3)] does not show optical isomerism. Reason. It has a plane of symmetry.

Assertion: Bond angle in ethers is slightly less than the tetrahedral angle. Reason: There is a repulsion between the two bulky (-R) group.

Assertion :Conformers are impractical to separate. Reason :Conformers have negligibly small difference in their potential energy