94420 + Interview Questions in Chemistry in Class 12

1.	Assertion : Detergents with low CMC are more economical to use. Reason : Cleansing action of detergents involves the formation of micelles. These are formed when the concentration of detergents becomes equal to CMC.
Answer» ASSERTION and REASON both are correct and the reason is correct EXPLANATION of assertion. Assertion and reason both are correct but reason does not EXPOLAIN assertion. Assertion is correct but reason is incorrect. Both assertion and reason are incorrect. Answer :a

Discussion

2.	Assertion. Detergents are preferred to soaps for washing purposes. Reason. Detergents having branched hydrocarbon chains are non-biodegradable.
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 explanation : The calcium and magnesium salts of detergents unlike those of soaps are soluble in WATER

Discussion

3.	Assertion : Detergents are superior to soaps. Reason : Higher the TFM better is the quality of soap
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 :B

Discussion

4.	Assertion : Desilverisation of lead is done by Parke's method. Reason : When lead-silver alloy is poor in silver, zinc is added to molten ore.
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

5.	Assertion : Deoxyribose , C_5H_10O_4 is not a carbohydrate. Reason : Carbohydrates are hydrates of carbon so compounds which follow C_(x)(H_2O)_y formula are carbohydrates.
Answer» If both assertion and reason are TRUE , and 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 asseration is true , but reason is FALSE. If both assertion and reason are false. Solution :Correct assertion : Deoxyribose `(C_5H_10O_4)` is a carbohydrate. Correct reason : OPTICALLY active polyhydroxyaldehydes or ketones or substances which GIVE these on hydrolysis are called carbohydrates.

Discussion

6.	Assertion : DeltaG^(@)=-nFE_(cell)^(@). Reason : E_(cell)^(@) should be positive for an electrochemical cell.
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 :(C ) Correct reason. `E_(cell)^(@)` should be negative for an ELECTROCHEMICAL cell.

Discussion

7.	Assertion : Dacron is formed by step growth polymerisation of monomer units . Reason : Dacron fibre is crease resistant .
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. Answer :B

Discussion

8.	Assertion : D-glucose is dextrorotatory whereasL-glucose is laevorotatory. Reason : D-compounds are always dextro and L-compounds are always laevorotatory
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 :D and L have no RELATION with the optical rotation. Carbohydrates having D configuration may be either DEXTROROTARY or laevorotary e.g., D glucose is DEXTROROTATORY while D-fructose is laevorotatory.

Discussion

9.	Assertion :D.(+)-Glucose is dextrorotatory in nature. Reason : 'D' represents its dextrorotatory nature.
Answer» Assertion and reason both are CORRECT statements and reason explains the assertion. Both assertion and reason are wrong statements. Assertion is correct statement and reason is wrong statement. Assertion is wrong statement and reason is correct statement. Solution :Correct reason . D-suggests that the CONFIGURATION of the `-OH` at the penultimate carbon is TOWARDS RIGHT.

Discussion

10.	Assertion : Ce^(4+) is good analytical reagent. Reason: Ce^(4+) has the tendency to change to Ce^(3+)
Answer» If both assertion and reason are true and reason is the CORRECT EXPLANATION of assertion. If both assertion and reason are true and reason not is the correct explanation of assertion. If assertion is TRUN but reason is false. If both assertion and reason are false. Answer :A

Discussion

11.	Assertion :- Cycolobutane is less stable than cyclopentane. Reason :- presence of bent bonds causes loss of orbital overlap.
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 Assertiion. If Assertion is True but the Reason is False. If both Assertion & Reason are False Answer :A

Discussion

12.	Assertion : Catalyst affects the final state of the equlibrium. Reason: It enables the system to attain a new equilibrium state by complexing with the reagents.
Answer» If both ASSERTION and REASON are TRUE and the reason in 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. ANSWER :D

Discussion

13.	Assertion : Cyclohexanone exhibit keto-enol tautomerism. Reason : In cyclohexanone, one form contains enolic group (-C=C-OH).
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 and the 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 :In cyclohexanone keto-enol tautomerism is as FOLLOW

Discussion

14.	Assertion: Catalyst changes Gibbs free energy of a system. Reason: Catalyst changes pre-exponential factor for a reaction.
Answer» If both assertion and reason are 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 :d) Correct assertion: Catalyst cannot CHANGE FREE energy of a sytem. Correct reason: Catalyst cannot change pre-exponential factor for a reaction.

Discussion

15.	Assertion : Cyclohexa -2, 4-dieneone does not give positive test for ketones Reason : Enel form of Cyclohexa-2, 4-dieneone is more stable and it undergoes tautomerism
Answer» ASSERTION is true, REASON is true, Reason is a correct EXPLANATION for Assertion Assertion is true, Reason is true, Reason is not a correct explanation for Assertion Assertion is true, Reason is FALSE Assertion is false, Reason is true Answer :A

Discussion

16.	Assertion :- Catalyst change Gibbs free energy of system. Reason :- Catalyst changes preexponential factor of a chemical reaction.
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 :D

Discussion

17.	Assertion: CuSO_(4)5H_(2)O and FeSO_(4)7H_(2)O are blue and green colour compounds respectively. Reason: Both compounds have their specific colour due to phenomenon of polarisation of anion.
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

18.	Assertion :Carboxypeptidase is an exopeptidase. Reason : it cleaves N-terminal bond.
Answer» If both assertion and REASON are TRUE , and 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 asseration is true , but reason is FALSE. If both assertion and reason are false. Solution :Correct reason : Carboxypeptidase is an exopeptides since it cleaves the peptide chain at the C-terminal end.

Discussion

19.	Assertion: Current stops flowing when E_(cell)=0. Reason: Equilibrium of the cell reaction is attained.
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. Answer :A

Discussion

20.	Assertion: Cyclic silicates and chain silicates have the same general molecular formula. Reason: In cyclic silicates, three corners of each SiC_(4) tetradedron are shared while in chain silicates only two are shared with other tetrahedra.
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 the assertion and reason both are false. Solution :Two CORNERS per tetrahedron one SHARED in both the CASES.

Discussion

21.	Assertion: [Cu(en)_2]^(2+) is more stable than [Cu(NH_3)_4]^(2+) Reason: Both these complexes have a square planar shape.
Answer» Both Assertion & Reason are TRUE ,Reason is the correct EXPLANATION of Assertion Both Assertion & Reason are true, Reason is not correct explanation of Assertion Assertion is true , Reason is false Assertion is false , Reason is false ANSWER :B

Discussion

22.	Assertion : Current stops flowing when E_(cell)=0. Reason: Equilibrium of the cell reaction is attained.
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 :At equilibrium `E_(CELL)=0` and therefore current stops flowing.

Discussion

23.	Assertion : Carboxylic acids do not undergo Friedel - Crafts reaction. Reason : Carboxylgroup is meta-directing group.
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 :Carboxylic ACIDS do not undergo FRIEDEL - Crafts reaction because the -COOH group is deactivating and the catalyst aluminium chloride (Lewis acid) GETS bonded to the carboxyl group.

Discussion

24.	Assertion: Carboxylic acids contain a carbonyl group but do not give characteristic reactions of the carbonyl group. Reason: Due to resonance, the electrophilic nature of the carboxyl carbon is greatly reduced as compared to the carbonyl carbon in aldehydes and ketones.
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

25.	Assertion: Carboxylic acid exist as dimer. Reason: Carboxylic acid shows hydrogen bonding.
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 :Carboxylic AID exist as dimer DUE to the FORMATION of hydrogen bonding.

Discussion

26.	Assertion : Carbonyl compounds take part in nucleophilic addition reactions. Reason : These reactions are initiated by nucleophilic attack at the electron deficient carbon atom.
Answer» If both ASSERTION and REASON are CORRECT and reason is correct EXPLANATION for assertion. If both assertion and reason are correct and reason is not correct explanation for assertion. If assertion is correct but reason is incorrect. If assertion as WELL as reason are both incorrect. Solution :Reason is the correct explanation for assertion.

Discussion

27.	Assertion : Carbonate and sulphate are concentrated by froth floatation process Reason : Pine oil wets the gangue particle
Answer» Both (A) and (R ) are TRUE and (R ) is the CORRECT EXPLANATION of (A). Both (A) and (R ) are true and (R ) is not the correct explanation of (A). (A) true but (R ) false. Both (A) and (R ) are false. Answer :D

Discussion

28.	Assertion : CuFeS_(2) is concentrated by froth floatation method. Reason : CuFeS_(2) is main ore of copper.
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 :B

Discussion

29.	Assertion. Carbonate andhydroxide ores areconcentratedby frothfloatationprocess. Reason. In frothfloatation process,mineral oil is usedbecauseit perferentiallywets the gangue particles.
Answer» Ifbothassertionandreasonaretrue, ANDREASON is NOTTHE trueexplanationofthe ASSERTION. Ifbothassertionandreasonaretrue,butreasonis notthetrueexplanationoftheassertion. Ifassertionis true,butreason isfalse If bothassertionandreasonarefalse Solution :CORRECTASSERTION. Sulphideores areconcentratedbyfrothfloatationprocess. Correct reason. Infrothfloatationprocess,pineoilpreferentially wets the oreparticles.

Discussion

30.	Assertion : Carbon shows an anomalous behaviour in group 14. Reason : Carbon has maximum covalency of 4.
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 :B

Discussion

31.	Assertion : Carbon is used in blast furnace for reduction of Fe_(2)O_(3). Reason : The gangue present is silica which is acidic in nature.
Answer» Both (A) and (R ) are TRUE and (R ) is the CORRECT EXPLANATION of (A). Both (A) and (R ) are true and (R ) is not the correct explanation of (A). (A) true but (R ) false. Both (A) and (R ) are false. Answer :B

Discussion

32.	Assertion : Carbon has maximum tendency of catenation among group 14. Reason : C-Cbond strength is very strong.
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 :A

Discussion

33.	Assertion : Cuprous ion(Cu^(+)) is colouless whereas cupric ion (Cu^(++)) is blue in the aqueoussolution. Reason :Cuprous ion (Cu^(+))has unpaired electrons while cupric ion (Cu^(++))does not .
Answer» If both the assertion and reason are true andreason is correct explanation of the assertion . If both the assertion and reason are true but reason is not a correct explanation of the assertion . If the assertion is true but the reason is false. If both assertion and reason are false. Solution :Cuprous ions ` (CU^(+))` is colourless because it has no unpaired electrons in the 3d sub-shell as it has ` 3d^(10)` CONFIGURATION . The cupric ION ` (Cu^(++))` has one unpaired electron as it has configuration ` 3d^(9)` . By absorbingthe visible light the unpaired electron can migrate from one set of d-orbitals to another under the applied field of water molecules. Hencecupric ion `(Cu^(++))` in aqueoussolutionshows blue COLOUR.

Discussion

34.	Assertion : Cu^(2+) iodide is not known Reason : Cu^(2+)oxidises I^(-) to iodine.
Answer» Both ASSERTION and reason are TRUE and reason is the CORRECT explanation of the assertion . Both assertion and reason are true but reason is not the CORREC explanation of assertion. Assertion is not true for reason is true Both assertion and reason are false. ANSWER :A

Discussion

35.	Assertion :- Camphor is used as solvent in the determination of moleclar masses of naphthalene, anthracene etc. Reason :- Camphor has high molal elevation constant.
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 :CAMPHOR has HIGH MOLAL DEPRESSION constant.

Discussion

36.	Assertion: Cu^(2+)(aq) is more stable than Cu^(2+)(aq) Reason: Electrode potential is more important in determining stable oxidation state than electronic configuration.
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 :A

Discussion

37.	Assertion :CaF_2 has been given the same fluorspar. Reason :Solid CaF_2 emits light when heated
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

38.	Assertion: Cu^(2+) iodide is not known. Reason: Cu^(2+)oxidises I– to iodine.
Answer» Both ASSERTION and REASON are TRUE, and reason is the CORRECT EXPLANATION of the assertion. Both assertion and reason are True, but reason is not the correct explanation of the assertion. Assertion is not True, but reason is True. Both assertion and reason are False. Answer :a

Discussion

39.	Assertion : Ca^(++) and K^(+) ions are responsible for maintaining proper osmotic pressure balance in the cells of organism. Reason : Solutions having the same osmotic pressure at same temp are called isotonic solutions.
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 asserrion is false but reason is true. SOLUTION :Sodium ION, `Na^(+)` and potassium ion, `K^(+)` are responsible for maintaining proper osmotic pressure balance inside and OUTSIDE of the CELLS of organisms.

Discussion

40.	Assertion: Cu^(2+)(aq) is less than Cu^(3+)(aq) but Fe^(3+) is more stable than Fe^(2+)(aq) Reason : Half filled and completely filled subshells are more stable
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

41.	Assertion Ca^(2+) and Ba^(2+) can be distinguished by treatment with Na_(2)C_(2)O_(4) solution. Reason CaC_(2)O_(4) is soluble in dilute acetic acid while BaC_(2)O_(4) is insoluble in dilute acetic acid solution.
Answer» ANSWER :C

Discussion

42.	Assertion: (C_(2)H_(5))_(3)N is less basic than trimethylamine (CH_(3))_(3)N Reason: Due to hyperconjugation of C_(2)H_(5) is less than methyl.
Answer» If both ASSERTION and reason are true and reason is the CORRECT EXPLANATION of assertion. If both assertion and reson 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 :C

Discussion

43.	Assertion: Cu^(2+) and Cd^(2+) are separated by first adding KCN solution and then passing H_(2)S gas. Reason: KCN reduces Cu^(2+) to Cu^(+) and form a complex with it.
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 :The correct explanation of assertion is KCN form complex with `Cu^(+) and Cd^(2+)` and `K_(3)[Cu(CN)_(4)]` and `K_(2)[Cd(CN)_(4)]` respectively. On passing `H_(2)S` only `Cd^(2+)` complex gets decomposed to yellow CDS PPT. Both assertion and reason are correct and reason is the correct explanation of assertion.

Discussion

44.	Assertion : C - O bond in metal carbonyl is long. Reason : There is delocalisation of electrons from filled d orbitals into the empty orbitals on the CO ligands.
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 reasonb is FALSE If both assertion and reason are false. Solution :C - O bond in METAL carbonyl is long as liganted CO has lower bond order. The lower B.O. is due to the TRANSFER of metal `d pi` electrons into the `pi^(**)` orbitals of ligated CO.

Discussion

45.	Assertion : Cu react with HCl & form H_(2) gas Reason : Cu above then hydrogen in electro chemical series
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. Solution :both are WRONG.

Discussion

46.	Assertion: C Cl_(4) is not a fire extinguisher. Reason: C Cl_(4) is insoluble in water.
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 assertion is false but reason is true Solution :`C Cl_(4)` is used as a fire extinguisher. Its DENSE, non-combustible vapours cover the burning substance and prevents the availability of oxygen around burning material.

Discussion

47.	Assertion: Cu is less reactive than hydrogen. Reason : E_(Cu^(2+)//Cu)^(Theta) is negative.
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 :Assertion is true, but the reason is false. Standard electrode potential of `E^(@)" "CU^(2+)//Cu=0.34` V and `E_(H^(+)//H_(2))^(Theta)=0.0V`. This shows that copper is less REACTIVE than HYDROGEN.

Discussion

48.	Assertion :C Cl_(4) is a non-polar molecule. Reason : C Cl_(4) has polar bonds.
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 but reason is not the correct explanation of assertion Answer :D

Discussion

49.	Assertion: Cu cannot liberate hydrogen froma acids. Reason : Because it has positive electrode potential.
Answer» Both assertion and reason are TRUE and reason is the CORRECT explanation of the assertion . Both assertion and reason are true but reason is not the CORREC explanation of assertion. Assertion is not true for reason is true Both assertion and reason are FALSE. Answer :a

Discussion

50.	Assertion : Butter and cheese are emulsions Reason: Emulsion is a colloidal solution of liquid dispersed in solid.
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

Explore topic-wise InterviewSolutions in Current Affairs.

Assertion : Detergents with low CMC are more economical to use. Reason : Cleansing action of detergents involves the formation of micelles. These are formed when the concentration of detergents becomes equal to CMC.

Assertion. Detergents are preferred to soaps for washing purposes. Reason. Detergents having branched hydrocarbon chains are non-biodegradable.

Assertion : Detergents are superior to soaps. Reason : Higher the TFM better is the quality of soap

Assertion : Desilverisation of lead is done by Parke's method. Reason : When lead-silver alloy is poor in silver, zinc is added to molten ore.

Assertion : Deoxyribose , C_5H_10O_4 is not a carbohydrate. Reason : Carbohydrates are hydrates of carbon so compounds which follow C_(x)(H_2O)_y formula are carbohydrates.

Assertion : DeltaG^(@)=-nFE_(cell)^(@). Reason : E_(cell)^(@) should be positive for an electrochemical cell.

Assertion : Dacron is formed by step growth polymerisation of monomer units . Reason : Dacron fibre is crease resistant .

Assertion : D-glucose is dextrorotatory whereasL-glucose is laevorotatory. Reason : D-compounds are always dextro and L-compounds are always laevorotatory

Assertion :D.(+)-Glucose is dextrorotatory in nature. Reason : 'D' represents its dextrorotatory nature.

Assertion : Ce^(4+) is good analytical reagent. Reason: Ce^(4+) has the tendency to change to Ce^(3+)

Assertion :- Cycolobutane is less stable than cyclopentane. Reason :- presence of bent bonds causes loss of orbital overlap.

Assertion : Catalyst affects the final state of the equlibrium. Reason: It enables the system to attain a new equilibrium state by complexing with the reagents.

Assertion : Cyclohexanone exhibit keto-enol tautomerism. Reason : In cyclohexanone, one form contains enolic group (-C=C-OH).

Assertion: Catalyst changes Gibbs free energy of a system. Reason: Catalyst changes pre-exponential factor for a reaction.

Assertion : Cyclohexa -2, 4-dieneone does not give positive test for ketones Reason : Enel form of Cyclohexa-2, 4-dieneone is more stable and it undergoes tautomerism

Assertion :- Catalyst change Gibbs free energy of system. Reason :- Catalyst changes preexponential factor of a chemical reaction.

Assertion: CuSO_(4)*5H_(2)O and FeSO_(4)*7H_(2)O are blue and green colour compounds respectively. Reason: Both compounds have their specific colour due to phenomenon of polarisation of anion.

Assertion :Carboxypeptidase is an exopeptidase. Reason : it cleaves N-terminal bond.

Assertion: Current stops flowing when E_(cell)=0. Reason: Equilibrium of the cell reaction is attained.

Assertion: Cyclic silicates and chain silicates have the same general molecular formula. Reason: In cyclic silicates, three corners of each SiC_(4) tetradedron are shared while in chain silicates only two are shared with other tetrahedra.

Assertion: [Cu(en)_2]^(2+) is more stable than [Cu(NH_3)_4]^(2+) Reason: Both these complexes have a square planar shape.

Assertion : Current stops flowing when E_(cell)=0. Reason: Equilibrium of the cell reaction is attained.

Assertion : Carboxylic acids do not undergo Friedel - Crafts reaction. Reason : Carboxylgroup is meta-directing group.

Assertion: Carboxylic acids contain a carbonyl group but do not give characteristic reactions of the carbonyl group. Reason: Due to resonance, the electrophilic nature of the carboxyl carbon is greatly reduced as compared to the carbonyl carbon in aldehydes and ketones.

Assertion: Carboxylic acid exist as dimer. Reason: Carboxylic acid shows hydrogen bonding.

Assertion : Carbonyl compounds take part in nucleophilic addition reactions. Reason : These reactions are initiated by nucleophilic attack at the electron deficient carbon atom.

Assertion : Carbonate and sulphate are concentrated by froth floatation process Reason : Pine oil wets the gangue particle

Assertion : CuFeS_(2) is concentrated by froth floatation method. Reason : CuFeS_(2) is main ore of copper.

Assertion. Carbonate andhydroxide ores areconcentratedby frothfloatationprocess. Reason. In frothfloatation process,mineral oil is usedbecauseit perferentiallywets the gangue particles.

Assertion : Carbon shows an anomalous behaviour in group 14. Reason : Carbon has maximum covalency of 4.

Assertion : Carbon is used in blast furnace for reduction of Fe_(2)O_(3). Reason : The gangue present is silica which is acidic in nature.

Assertion : Carbon has maximum tendency of catenation among group 14. Reason : C-Cbond strength is very strong.

Assertion : Cuprous ion(Cu^(+)) is colouless whereas cupric ion (Cu^(++)) is blue in the aqueoussolution. Reason :Cuprous ion (Cu^(+))has unpaired electrons while cupric ion (Cu^(++))does not .

Assertion : Cu^(2+) iodide is not known Reason : Cu^(2+)oxidises I^(-) to iodine.

Assertion :- Camphor is used as solvent in the determination of moleclar masses of naphthalene, anthracene etc. Reason :- Camphor has high molal elevation constant.

Assertion: Cu^(2+)(aq) is more stable than Cu^(2+)(aq) Reason: Electrode potential is more important in determining stable oxidation state than electronic configuration.

Assertion :CaF_2 has been given the same fluorspar. Reason :Solid CaF_2 emits light when heated

Assertion: Cu^(2+) iodide is not known. Reason: Cu^(2+)oxidises I– to iodine.

Assertion : Ca^(++) and K^(+) ions are responsible for maintaining proper osmotic pressure balance in the cells of organism. Reason : Solutions having the same osmotic pressure at same temp are called isotonic solutions.

Assertion: Cu^(2+)(aq) is less than Cu^(3+)(aq) but Fe^(3+) is more stable than Fe^(2+)(aq) Reason : Half filled and completely filled subshells are more stable

Assertion Ca^(2+) and Ba^(2+) can be distinguished by treatment with Na_(2)C_(2)O_(4) solution. Reason CaC_(2)O_(4) is soluble in dilute acetic acid while BaC_(2)O_(4) is insoluble in dilute acetic acid solution.

Assertion: (C_(2)H_(5))_(3)N is less basic than trimethylamine (CH_(3))_(3)N Reason: Due to hyperconjugation of C_(2)H_(5) is less than methyl.

Assertion: Cu^(2+) and Cd^(2+) are separated by first adding KCN solution and then passing H_(2)S gas. Reason: KCN reduces Cu^(2+) to Cu^(+) and form a complex with it.

Assertion : C - O bond in metal carbonyl is long. Reason : There is delocalisation of electrons from filled d orbitals into the empty orbitals on the CO ligands.

Assertion : Cu react with HCl & form H_(2) gas Reason : Cu above then hydrogen in electro chemical series

Assertion: C Cl_(4) is not a fire extinguisher. Reason: C Cl_(4) is insoluble in water.

Assertion: Cu is less reactive than hydrogen. Reason : E_(Cu^(2+)//Cu)^(Theta) is negative.

Assertion :C Cl_(4) is a non-polar molecule. Reason : C Cl_(4) has polar bonds.

Assertion: Cu cannot liberate hydrogen froma acids. Reason : Because it has positive electrode potential.

Assertion : Butter and cheese are emulsions Reason: Emulsion is a colloidal solution of liquid dispersed in solid.

Assertion: CuSO_(4)5H_(2)O and FeSO_(4)7H_(2)O are blue and green colour compounds respectively. Reason: Both compounds have their specific colour due to phenomenon of polarisation of anion.