94420 + Interview Questions in Chemistry in Class 12

1.	Assertion : Boiling points of cis-isomers are higher than trans - isomers. Reason : Dipole moments of cis - isomers are higher than trans - isomers.
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 :Boiling points of isomeric COMPOUNDS depend on dipole-dipole interactions and cis-isomers have GREATER dipole MOMENT (more polar) than trans-isomers (less polar).

Discussion

2.	Assertion:Conductivity of all electrolytes decreases on dilution. Reason:On dilution number of ions per unit volume decreases.
Answer» Both assertion and REACTION are TRUE and the REASON is correct explanation for assertion Both assertion and reason are true and reason is not correct explanation for assertion ) Assertion is true but the reason is FALSE. Both assertion and reason are false. Solution :Reason is the correct explanation for assertion.

Discussion

3.	Assertion: Boiling points of alcohols and ethers are high. Reason: They can form intermolecular hydrogen-bonding.
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. The boiling point of ALCOHOLS are higher than those of ethers of COMPARABLE MOLECULAR mass. Correct reason. Alcohols can form intermolecular H-bonds but ethers do not.

Discussion

4.	Assertion: Conductivity of all electrolytes decreases on dilution. Reason: on dilution, number of ions per unit volume decreases.
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

5.	Assertion : Bleacing action of SO_(2) is due to reduction Reason : Bleaching action of all bleaching agents is due to reduction
Answer» Statement-I and Statement-II are CORRECT and Statement-II is correct EXPLANATION of Statement-I Statement-I and Statement-II are correct and Statement-II is not correct explanation of Statement-I Statement-I is correct and Statement-II is not correct Statement-I is not correct and Statement-II is correct Answer :C

Discussion

6.	Assertion : Conductivity of all electrolytes de-creases on dilution. Reason: On dilution number of ions per unit volume decreases.
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 true and the reason is the correct explanation of assertion. * Conductivity always decreases with decrease in concentration both for weak and strong electrolytes. This can be explained by the fact that the number of ions per unit VOLUME that carry the current in a solution decreases on dilution.

Discussion

7.	Assertion: Bleaching powder reacts with dilure acids to evolve chlorine Reason: The chlorine liberated by the action of dilute acids on bleaching powder is called avilable chlorine .
Answer» if both ASSERTION and reason are true and reason is THR correct explanationof 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 reson are false. Solution :The reaction involved is `CaOCl_2+H_2SO_4 RARR CaSO_4 + H_2O+cl_2` The available CHLORINE may be difined as the % of chlorine leiberated when one mole of bleaching powder (127 G) is treated with excess of diute `h_2SO_4`

Discussion

8.	Assertion: concentrated solution of BiCl_(3) can be hydrolysed with water. Reason: BiCl_(3) does not change in composition with dilution.
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 :A

Discussion

9.	Assertion. Bithional is added to soap for its beautification and solidification. Reason. Bithional is a sulpha drug.
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 assertion. Bithional is ADDED to soap as an antiseptic. It reduces odours produced by BACTERIAL decomposition of ORGANIC matter on the skin Correct reason. Bithional is an antiseptic.

Discussion

10.	Assertion: Concentrated aqueous solution of CuCl_(2) is green in colour. Reason : The solution contains two complex ions i.e., [Cu(H_(2)O)_(4)]^(2+) and [CuCl_(4)]^(2-) in equilibrium.
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

11.	Assertion: Conc H_(2)SO_(4) cannot be used for drying up H_(2)S Reason : Conc H_(2)SO_(4) oxidises H_(2)S to S
Answer» Statement-I and Statement-II are CORRECT and Statement-II is correct EXPLANATION of Statement-I Statement-I and Statement-II are correct and Statement-II is not correct explanation of Statement-I Statement-I is correct and Statement-II is not correct Statement-I is not correct and Statement-II is correct Answer :A

Discussion

12.	Assertion: BiI_(3) withh triiodide (I_(3)^(-)) ion never exists. Reason: Intramoleclar redox reaction takes place between bismuth cation and triiodide ion.
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 :C

Discussion

13.	Assertion: Compressibility factor for hydrogen varies with pressure with positive slope at all pressures. Reason: Even at low pressures, repulsive forces dominate hydrogen gas.
Answer» If both assertion and REASON are TRUE and the reason is 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 :In case of `H_(2)`, compressibility factor increase with the pressure . At 273 K, `Z gt 1` which shows that it is difficult to compress the gas as compared to IDEAL gas. In this case repulsive FORCES dominate.

Discussion

14.	Assertion : BF_(3) undergoes in partial hydrolysis Reason : Due to strong back bonding in BF_(3) only twoflouride groups have come out on nucleaophili attack by H_(2)O.
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 :A

Discussion

15.	Assertion: Compounds containing -CHO group are easily oxidized to corresponding carboxylic acids. Reason: Carboxylic acids can be reduced to alcohols by treatment with LiAlH_(4).
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 and reason both are correct statement but reason is not correct explanation of assertion. Solution :Correct explanation. Due to electron-withdrawing nature of C=O group, C-H bond is aldehdyes is weak and thus can be easily oxidised to the corresponding CARBOXYLIC ACIDS even with MILD oxidising agents like FEHLING's solution and Tollens' reagents.

Discussion

16.	Assertion : BF_3 is a Lewis acid. Reason : It accepts a pair of electrons due to the presence of vacant orbital in the valence shell of boron.
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 :A

Discussion

17.	Assertion: Compound having X-O-H linkage (X=non-metal) always acts as Arrhenius acid. Reason: Bond polarrity of O-H bond is higher than that of X-O bond.
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

18.	Assertion: Complexes containing ambidentate ligands exhibit co-ordination isomerism. Reason:Co-ordination isomerism is shown by anionic complexes only.
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 :D

Discussion

19.	Assertion : beta- hydrogen atom of carbonyl compounds is acidic in nature. Reason : beta- hydrogen is directly attached to carbon next to carbonyl carbon.
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 :`alpha`- hydrogen is attached to carbon next to carbonyl carbon and it is ACIDIC in nature.

Discussion

20.	Assertion : Complexes of MX_(6) and MX_(5)L type (X and L are unidentate) do not show geometrical isomerism. Reason : Geometrical isomerism is not shown by complexes of coordination number 6.
Answer» Solution :CORRECT explanation. COMPLEXES of the type `MX_(6)` and `MX_(5)L` do not show geometrical isomerism because CHANGE of position of ligands gives the same arrangement.

Discussion

21.	Assertion : Benzyl bromide when kept in acetone water it produces benzyl alcohol. Reason : The reaction follows S_(N^(2)) mechanism.
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 :The assertion that on keeping benzyl bromide in ACETONE water it produces benzyl alcohol is correct. Because `C_(6)H_(5)CH_(2)Br` hydrolysed to PRODUCE `C_(6)H_(5)CH_(2)OH`. This conversion is of `S_(N^(2))` mechanism.

Discussion

22.	Assertion: Complex ion [Co(NH_(3))_(6)]^(2+) is readily oxidized to [Co(NH_(3))_(6)]^(3+) Reason: Unpaired electron in complex ion [Co(NH_(3))_(6)]^(2+) is present in 4p orbital.
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 :A

Discussion

23.	Assertion: Be(OH)_(2) dissolves in excess NaOH solution. Reason: Be(OH)_(2) is an acidic compound.
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 Solution :`Be(OH)_(2)` is amphoteric in NATURE.

Discussion

24.	Assertion: Benzyl bromide when kept in acetone-water, produces benzyl alcohol. Reason: The reaction follows S_(N)2 mechanism.
Answer» If both assertionn 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 reason. Benzyl halides undergo HYDROLYSIS by `S_(N)1` MECHANISM.

Discussion

25.	Assertion : Competitive inhibitors compete with natural substrate for their attachment on the active sites of enzymes Reason : In competitive inhibition, inhibitor binds to the allosteric site of the enzyme.
Answer» Assertion and reason both are CORRECT STATEMENT but reason does not EXPLAIN assertion Assertion and reason both are correct and reason EXPLAINS the assertion Both assertion and reason are wrong statement Assertion is correct statement reason is wrong statement Solution :Correct reason. In competitive inhibition, INHIBITOR binds to the active site of the enzyme.

Discussion

26.	Assertion: Benzenediazonium chloride on boiling with water gives phenol. Reason: C-N bond is polar.
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 o the assertion. if assertion is true, but reason is false. If both assertion and reason are false. Solution :Correct explanation. BENZENEDIAZONIUM chloride decomposes to form `C_(6)H_(5)^(+)` which upon nucleophilic attack by water followed by loss of a proton gives phenol.

Discussion

27.	Assertion : Colloidal solutions show colligative properties. Reason : Colloidal particles are larger in size.
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

28.	Assertion : Benzene forms benzene sulphonic acid with fuming H_2SO_4 at high temperature . Reason : The attacking species is SO_3
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 butreason is not the correct explanation of the assertion if assertion is true but reason is false If assertion and reason both are false SOLUTION :With furning `H_2SO_4` or oleum (conc. `H_2SO_4 +SO_3`) at HIGH temperature benzene forms m-benzene disulphonic acid

Discussion

29.	Assertion. Colloidal solutions are stable but colloidal particles do not settle down. Reason. Brownian momement counters the force of gravity actively on colloidal particles.
Answer» If both ASSERTION and reason are ture, and reason is the trure 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 false. SOLUTION :R is the correct explanation of A.

Discussion

30.	Assertion: Benzoic acid is a weaker acid than formic acid Reason: Phenyl group when attached to carbonyl group becomes electron donating.
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

31.	Assertion : Colloidal solution show colligative properties. Reason : Colloidal solutions do not show brownian motion.
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. Solution :Correct explanation. Colloidal particles BEHAVE in the same way as particles of IONS or molecules.

Discussion

32.	Assertion : Benzeneexhibittowdifferentbondlength , dueto C- Csingleand C = C doublebonds . Reason : Actual structure of benzene is a hybrid of following two structures.
Answer» Assertionis correct, reason is correct, reason is a correct explanation for assertion. Assertionis correct, reason is correct, REASONIS not a correct explanation for assertion Assertionis correct, reasonis incorrect Assertion is incorrect, reasonis correct. SOLUTION :Zinc metal which has a more negative electrode potential than iron will provide electrons in PREFERENCE of the iron, and therefore CORRODES first. Onlywhen all the zinchasbeen oxidised,theironstarttorust.

Discussion

33.	Assertion : Colloidal solution do not show brownian motion. Resion : Brownian motion is responsible for stability of sols.
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. Solution :Correct Assertion. : COLLOIDAL sols show brownian motion.

Discussion

34.	Assertion: Benzene diazonium chloride does not give tests for nitrogen. Reason: N_(2) gas lost during heating.
Answer» Solution :It is true that benzene diazonium CHLORIDE does not respond LASSAIGNE test of nitrogen because benzene diazonium chloride loses `N_(2)` on SLIGHT heat and THUS if can'treact with sodium metal.

Discussion

35.	Assertion : Colloidal solution are quite stable. Reason : Brownian movement does not allow the particles to be acted by force of gravity
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 :A

Discussion

36.	Assertion: Benzene and toluene form an ideal solution. Reason: Successive homologues generally form ideal solutions.
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

37.	Assertion: Benzaldehyde is less reactive than ethanal towards nucleophilic attach. ltbr. Reason: All the carbon atoms of benzaldehyde are sp^(2)-hybridized.
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 explanation: DUE to ELECTRON donating effect of the benzene ring, the CARBONYL carbon of benzaldehyde is less electrophilic.

Discussion

38.	Assertion : Coke and flux are used in smelting. Reason : The phenomenon in which ore is mixed with suitable flux and coke is heated to fusion is known as smelting.
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 :Both assertion and reason are true of but reason is not correct explanation of assertion. Non fusible mass PRESENT in ore in MIXIN with suitable flux are fused which are them reduced by COKE to give free metal.

Discussion

39.	Assertion: Basic radical of V group are precipitated as their carbonates in presence of NH_(4)Cl. Reason: NO_(4)OH maintains the pH of the solution basic.
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 Solution :GROUP reagent for V group is `(NH_(4))_(2)CO_(3)` is PRESENCE of `NH_(4)Cl` and because of `NH_(4)OH,pH` of solution is maintained.

Discussion

40.	Assertion : Co[Hg(SCN)_(6)] and Hg[Co(SCN)_(6)] are isomers. Reason : SCN^(−) is a stronger ligand as compared to NCS^(−)
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 :C

Discussion

41.	Assertion: BeCi_(2) cannot be easily hydrolysed. Reason: BeCl_(2) is electron deficient compound.
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 Solution :`BeCl_(2)` can be easily hydrolysed DUE to its `e^(-)` deficient NATURE. `BeCl_(2)+2H_(2)O to Be(OH)_(2)+2HCL(uarr)`

Discussion

42.	Assertion : Cobalt-60 is useful in cancer therapy. Reason : Cobalt-60 is source of gamma-radiations capable of killing cancerous cell.
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. Answer :A

Discussion

43.	Assertion: BaSO_(4) is insoluble in water. Reason: Lattice energy of BaSO_(4) is higher than its hydration 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 :A

Discussion

44.	Assertion : Coagulation power of Al^(3+)is more than Na^(+) .Reason : greater the valency of the flocculating ion added, greater is its power to cause precipitation .
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. Solution : If both assertion and reason are true and reason is the correct explanation of assertion. (Hardy-Sechulze rule)

Discussion

45.	Assertion: Bakelite is hard and has high melting point. Reason : Interparticle forces of attraction in it are due to H-bonding.
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 reason : It is a highly cross -linked POLYMER.

Discussion

46.	Assertion : Coagulation power of Al^(3+) is more than Na^(+). Reason : Greater the valency of the flocculating ion added, greater is its power to cause precipitation (Hardy Schulze rule).
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

47.	Assertion : Bakelite is a thermosetting polymer. Reason : Bakelite is formed by cross- linking of novolac and formaldehyde .
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 :A

Discussion

48.	Assertion : BaCO_(3) is more soluble in HNO_(3) than in plain water. Reason : Carbonate is a weak base and reacts with the H^(+) from the strong acid, causing the barium salt to dissociate.
Answer» If both ASSERTION and reason are true and reason is the correct EXPLANATION of the assertion If both assertion and reason aretrue but reason is not the correct explanation is true but reason is false. If the assertion and reason both are false. If the assertion and reason both are false. Solution :BARIUM carbonate is more soluble in `HNO_(3)` than in water because carbonate is a weak base and REACTS with the `H^(+)` ion of `HNO_(3)` causing the barium salt to dissociate. `BaCO_(3) + HNO_(3) RARR Ba(NO_(3))_(2) + CO_(2) + H_(2)O`

Discussion

49.	Assertion :- CO_(2) is carried in plasma mainly as HCO_(3) ions. Reason :- 23% CO_(2) transport is in the form of HCO_(3) ions.
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 :C

Discussion

50.	Assertion (A):Zone refining is based on the priniciple of fractional crystallisation Reason (R ):This process is carried out in an inert gas temprature.
Answer» A and R are correct R EXPLAIN A A and R are correct,R does not EXPLAINS A A is correct but R is wrong A is wrong but R is correct Answer :b

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Assertion : Boiling points of cis-isomers are higher than trans - isomers. Reason : Dipole moments of cis - isomers are higher than trans - isomers.

Assertion:Conductivity of all electrolytes decreases on dilution. Reason:On dilution number of ions per unit volume decreases.

Assertion: Boiling points of alcohols and ethers are high. Reason: They can form intermolecular hydrogen-bonding.

Assertion: Conductivity of all electrolytes decreases on dilution. Reason: on dilution, number of ions per unit volume decreases.

Assertion : Bleacing action of SO_(2) is due to reduction Reason : Bleaching action of all bleaching agents is due to reduction

Assertion : Conductivity of all electrolytes de-creases on dilution. Reason: On dilution number of ions per unit volume decreases.

Assertion: Bleaching powder reacts with dilure acids to evolve chlorine Reason: The chlorine liberated by the action of dilute acids on bleaching powder is called avilable chlorine .

Assertion: concentrated solution of BiCl_(3) can be hydrolysed with water. Reason: BiCl_(3) does not change in composition with dilution.

Assertion. Bithional is added to soap for its beautification and solidification. Reason. Bithional is a sulpha drug.

Assertion: Concentrated aqueous solution of CuCl_(2) is green in colour. Reason : The solution contains two complex ions i.e., [Cu(H_(2)O)_(4)]^(2+) and [CuCl_(4)]^(2-) in equilibrium.

Assertion: Conc H_(2)SO_(4) cannot be used for drying up H_(2)S Reason : Conc H_(2)SO_(4) oxidises H_(2)S to S

Assertion: BiI_(3) withh triiodide (I_(3)^(-)) ion never exists. Reason: Intramoleclar redox reaction takes place between bismuth cation and triiodide ion.

Assertion: Compressibility factor for hydrogen varies with pressure with positive slope at all pressures. Reason: Even at low pressures, repulsive forces dominate hydrogen gas.

Assertion : BF_(3) undergoes in partial hydrolysis Reason : Due to strong back bonding in BF_(3) only twoflouride groups have come out on nucleaophili attack by H_(2)O.

Assertion: Compounds containing -CHO group are easily oxidized to corresponding carboxylic acids. Reason: Carboxylic acids can be reduced to alcohols by treatment with LiAlH_(4).

Assertion : BF_3 is a Lewis acid. Reason : It accepts a pair of electrons due to the presence of vacant orbital in the valence shell of boron.

Assertion: Compound having X-O-H linkage (X=non-metal) always acts as Arrhenius acid. Reason: Bond polarrity of O-H bond is higher than that of X-O bond.

Assertion: Complexes containing ambidentate ligands exhibit co-ordination isomerism. Reason:Co-ordination isomerism is shown by anionic complexes only.

Assertion : beta- hydrogen atom of carbonyl compounds is acidic in nature. Reason : beta- hydrogen is directly attached to carbon next to carbonyl carbon.

Assertion : Complexes of MX_(6) and MX_(5)L type (X and L are unidentate) do not show geometrical isomerism. Reason : Geometrical isomerism is not shown by complexes of coordination number 6.

Assertion : Benzyl bromide when kept in acetone water it produces benzyl alcohol. Reason : The reaction follows S_(N^(2)) mechanism.

Assertion: Complex ion [Co(NH_(3))_(6)]^(2+) is readily oxidized to [Co(NH_(3))_(6)]^(3+) Reason: Unpaired electron in complex ion [Co(NH_(3))_(6)]^(2+) is present in 4p orbital.

Assertion: Be(OH)_(2) dissolves in excess NaOH solution. Reason: Be(OH)_(2) is an acidic compound.

Assertion: Benzyl bromide when kept in acetone-water, produces benzyl alcohol. Reason: The reaction follows S_(N)2 mechanism.

Assertion : Competitive inhibitors compete with natural substrate for their attachment on the active sites of enzymes Reason : In competitive inhibition, inhibitor binds to the allosteric site of the enzyme.

Assertion: Benzenediazonium chloride on boiling with water gives phenol. Reason: C-N bond is polar.

Assertion : Colloidal solutions show colligative properties. Reason : Colloidal particles are larger in size.

Assertion : Benzene forms benzene sulphonic acid with fuming H_2SO_4 at high temperature . Reason : The attacking species is SO_3

Assertion. Colloidal solutions are stable but colloidal particles do not settle down. Reason. Brownian momement counters the force of gravity actively on colloidal particles.

Assertion: Benzoic acid is a weaker acid than formic acid Reason: Phenyl group when attached to carbonyl group becomes electron donating.

Assertion : Colloidal solution show colligative properties. Reason : Colloidal solutions do not show brownian motion.

Assertion : Benzeneexhibittowdifferentbondlength , dueto C- Csingleand C = C doublebonds . Reason : Actual structure of benzene is a hybrid of following two structures.

Assertion : Colloidal solution do not show brownian motion. Resion : Brownian motion is responsible for stability of sols.

Assertion: Benzene diazonium chloride does not give tests for nitrogen. Reason: N_(2) gas lost during heating.

Assertion : Colloidal solution are quite stable. Reason : Brownian movement does not allow the particles to be acted by force of gravity

Assertion: Benzene and toluene form an ideal solution. Reason: Successive homologues generally form ideal solutions.

Assertion: Benzaldehyde is less reactive than ethanal towards nucleophilic attach. ltbr. Reason: All the carbon atoms of benzaldehyde are sp^(2)-hybridized.

Assertion : Coke and flux are used in smelting. Reason : The phenomenon in which ore is mixed with suitable flux and coke is heated to fusion is known as smelting.

Assertion: Basic radical of V group are precipitated as their carbonates in presence of NH_(4)Cl. Reason: NO_(4)OH maintains the pH of the solution basic.

Assertion : Co[Hg(SCN)_(6)] and Hg[Co(SCN)_(6)] are isomers. Reason : SCN^(−) is a stronger ligand as compared to NCS^(−)

Assertion: BeCi_(2) cannot be easily hydrolysed. Reason: BeCl_(2) is electron deficient compound.

Assertion : Cobalt-60 is useful in cancer therapy. Reason : Cobalt-60 is source of gamma-radiations capable of killing cancerous cell.

Assertion: BaSO_(4) is insoluble in water. Reason: Lattice energy of BaSO_(4) is higher than its hydration energy

Assertion : Coagulation power of Al^(3+)is more than Na^(+) .Reason : greater the valency of the flocculating ion added, greater is its power to cause precipitation .

Assertion: Bakelite is hard and has high melting point. Reason : Interparticle forces of attraction in it are due to H-bonding.

Assertion : Coagulation power of Al^(3+) is more than Na^(+). Reason : Greater the valency of the flocculating ion added, greater is its power to cause precipitation (Hardy Schulze rule).

Assertion : Bakelite is a thermosetting polymer. Reason : Bakelite is formed by cross- linking of novolac and formaldehyde .

Assertion : BaCO_(3) is more soluble in HNO_(3) than in plain water. Reason : Carbonate is a weak base and reacts with the H^(+) from the strong acid, causing the barium salt to dissociate.

Assertion :- CO_(2) is carried in plasma mainly as HCO_(3) ions. Reason :- 23% CO_(2) transport is in the form of HCO_(3) ions.

Assertion (A):Zone refining is based on the priniciple of fractional crystallisation Reason (R ):This process is carried out in an inert gas temprature.