94420 + Interview Questions in Chemistry in Class 12

1.	Assertion(A): Boiling point of ethanol is higher in comparison to methoxy methane. Reason (R): Ethanolis associated with inter molecular hydroxide bonding whereas in methoxy methane, inter molecular hydrogen bonding is not present.
Answer» Both A and R are CORRECT and R is the CORREET explanation of A. Both A and R are correct but R is not the correct explanation of A Both A and R are not correct A is correct but R is WRONG SOLUTION :Both A and R are correct and R is the correet explanation of A.

Discussion

2.	Assertion(A): Bithional is added to soap as an antiseptic. Reason (R): Bithional is a sulpha drug and destroy bacteria.
Answer» Both A and R are CORRECT and R EXPLAINS A. Both A and R are correct but R does not EXPLAIN A. A is correct but R is WRONG. A is wrong but R is correct. Answer :A

Discussion

3.	Assertion(A): Benzoic acid does not undergo friedel crafts reaction. Reason (R): This is due to the strong deactivating nature of the carboxyl group
Answer» Both A and R are CORRECT and R is the correct EXPLANATION of A. Both A and R are correct but R is not correct explanation of A A is correct but R is wrong A is wrong but R is correct ANSWER :A

Discussion

4.	Assertion(A): Benzene is obviously an unsaturated hydrocarbon because it has for less hydrogen than the equivalent saturated hydrocarbon C_(6)H_(14), but benzene is too stable to be an alkene. Reason:Benzene is resonance stablised.
Answer» ANSWER :A

Discussion

5.	Assertion(A): Aspirin is an antipyretic and useful in the prevention of heart attacks. Reason (R): Aspirin reduces fever and also prevent platelet coagulation
Answer» Both A and R are CORRECT and R is the correct EXPLANATION of A Both A and R are correct but R does not EXPLAIN A. A is correct but R is WRONG. A is wrong but R is correct. Answer :A

Discussion

6.	Assertion(A): Aspirin has antipyretic properties. Reason (R): Aspirin gives relief from pain.
Answer» Both A and R are CORRECT and R EXPLAINS A. Both A and R are correct but R does not EXPLAIN A. A is correct but R is WRONG. A is wrong but R is correct. Answer :A

Discussion

7.	Assertion(A): Artificial sweeteners are added to the food to control the intake of calories. Reason (R): Most of the artificial sweeteners are inert and do not metabolise in the body.
Answer» Both A and R are CORRECT and R EXPLAINS A. Both A and Rare correct but R does not EXPLAIN A. A is correct but R is WRONG. A is wrong but R is correct. Answer :A

Discussion

8.	Assertion(A) : Aromatic amines are less baisc than amonia. Reason (R):The Ione pair of electrons on nitrogen atom in aniline (aromatic amine) gets delocalised over the benzene ring and less available for protonation.
Answer» Both A and R are correct and r is EXPLAINS A Both A and R but R is wrong A is correct but R is wrong A is wrong but R is correct Answer :A

Discussion

9.	Assertion(A): Aqueous gold colloidal solution is red in colour. Reason(R): The colour arises due to scattering of light by colloidal gold particles.
Answer» If both (A) and (R) are correct, and (R) is the correct explanation of (A) If both (A) and (R) are correct, but (R) is the correct explanation of (A). If (A) is correct, but (R) is incorrect. If (A) is incorrect, but (R) is correct. S Solution :The colours is due to SCATTERING. It DEPENDS upon the size of particles. Finest gold sol has RED colour. As the size of the particles increases, it becomes purple, then BLUE, and finally golden yellow.

Discussion

10.	Assertion(A): Aldehydes and ketones have high high boiling point as compared to hydrocarbon and ether of comparable molecular mass. Reason (R): It is due to weak molecular association in aldehydes and ketones arising out of the dipole - dipole interactions
Answer» Both A and R are CORRECT and R is the correct explanation of A. Both A and R are correct but R is not correct explanation of A A is correct but R is WRONG A is wrong but R is correct ANSWER :A

Discussion

11.	Assertion(A): Alkanes can have an infinite number of conformations Reason(R ):In configurational isomeris,the isomers are distinct individuals substances.
Answer» ANSWER :B

Discussion

12.	Assertion(A): Alkyl amines are stronger base than Ammonia. Reason(R):When a+I group like alkyl group is attached to nitrogen increases the electron density on the nitrogen which makes the electron pair readily available for protonation.
Answer» Both A and R are correct and r is EXPLAINS A Both A and R but R is wrong A is correct but R is wrong A is wrong but R is correct Answer :A

Discussion

13.	Assertion(A): Aldehydes and ketones have high dipole moment. Reason (R): The carbonyl group of aldehydes and ketones contain a double bond between carbon and oxygen. Oxygen is more electronegative than carbon and it attracts the shared pair of electron which makes the carbonyl group as polar.
Answer» Both A and R are CORRECT and R is the correct EXPLANATION of A. Both A and R are correct but R is not correct explanation of A A is correct but R is WRONG A is wrong but R is correct ANSWER :A

Discussion

14.	Assertion(A): Alcohols cannot be used as solvent for Grignard reagent. Reason (R): Alcohols are decomposed by Grignard reagents to give alkane.
Answer» Both A and R are CORRECT and R is the CORREET EXPLANATION of A. A is correct but R is WRONG A is wrong but R is correct Both A and R are correct but R is not correct explanation of A. Solution :Both A and R are correct and R is the correet explanation of A.

Discussion

15.	Assertion(A): Acylation of amines gives a mono substituted product whereas alkylation of amines gives polysubstituted product. Reason(R): Acyl gropu sterically hindered the approach to further acyl group.
Answer» Both A and R are CORRECT and r is explains A Both A and R but R is WRONG A is correct but R is wrong A is wrong but R is correct Answer :C

Discussion

16.	Assertion(A): Alcohols are dehydrated to hydrocarbons in the pressure of acidie zeolites. Reason(R): Zeolites are porous catalysts.
Answer» If both (A) and (R) are CORRECT, and (R) is the correct EXPLANATION of (A) If both (A) and (R) are correct, but (R) is the correct explanation of (A). If (A) is correct, but (R) is INCORRECT. If (A) is incorrect, but (R) is correct. S Solution :Dehygration is not due to POROUS nature but due to the acidic group present in zeolites.

Discussion

17.	Assertion(A): Addition of sodium bisulphite finds application in the separation and purification of carbonyl compound. Reason (R): The bisulphite addition compound is water soluble and the solution is treated with mineral acid to regenerate the carbonyl compounds.
Answer» Both A and R are CORRECT and R is the correct explanation of A. Both A and R are correct but R is not correct explanation of A A is correct but R is wrong A is wrong but R is correct ANSWER :A

Discussion

18.	Assertion(A): Acetanilide is less basic than aniline. Reason(R): Acetylation of aniline results in the decrease of electron density on nitrogen.
Answer» Both A and R are CORRECT and r is EXPLAINS A Both A and R but R is wrong A is correct but R is wrong A is wrong but R is correct Answer :A

Discussion

19.	Assertion(A): Acetaldehyde does not undergo cannizaro reaction. Reason (R): Cannizaro reaction is a characteristic of aldehyde having no alpha-H atom. Acetaldehyde contains 3 alpha -H atoms.
Answer» Both A and R are correct and R is the correct explanation of A. Both A and R are correct but R is not correct explanation of A A is correct but R is WRONG A is wrong but R is correct ANSWER :A

Discussion

20.	Assertion(A): Acetaldehyde and acetone are readily undergo aldol condensation reaction in the presence of dilute base.Reason (R): Aldehyde or ketone having a - hydrogen atom add together to give aldol or ketol.
Answer» Both A and R are CORRECT and R is the correct EXPLANATION of A. Both A and R are correct but R is not correct explanation of A A is correct but R is WRONG A is wrong but R is correct Answer :B

Discussion

21.	Assertion(A): A reaction cannot become fast by itself unless a catalyst is added.
Answer» If both (A) and (R) are correct, and (R) is the correct explanation of (A) If both (A) and (R) are correct, but (R) is the correct explanation of (A). If (A) is correct, but (R) is INCORRECT. If (A) is incorrect, but (R) is correct. S Solution :CATALYST always does not INCREASES the speed of reaction.

Discussion

22.	Assertion(A): A solution of bromine in C Cl_(4) is decolourised on passing acetylene gas through it. Reason Bromine is expelled from the solution by the acetylenegas.
Answer» ANSWER :C

Discussion

23.	Assertion(A): A disaccharide lactose act as reducing sugar. Reason (R): In lactose, beta - D galactoseand beta - D glucose are linked beta - 1, 4 - glycosidic bond in whichaldehyde group is not involved.
Answer» A is CORRECT but R is WRONG. Both A and R are correct but R is not the correct EXPLANATION of A. Both A and R are correct and R is the correct explanation of A. Ais wrong but R is correct. Answer :C

Discussion

24.	Assertion : Zone refining method is very useful for roducing semiconductors. Reason: Semiconductors are of high purity.
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. Assertion is false but reason is true. Solution :IMPURITIES of semiconductors are more soluble in molten STATE than in solid state.

Discussion

25.	Assertion : Zone refining method is very useful for producing semiconductors. Reason : Semiconductors are of high purity .
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 false but reason is false. Assertion is false but reason is true. Solution :Correct explanation : Zone refining is quite useful only if the metal of very high purity is NEEDED

Discussion

26.	Assertion :- Zn(s)+Cu^(+2)(aq)rarr Zn^(+2)(aq)+Cu(s) can be spilt into following half reactions {:(Zn(s)rarrZn^(+2)+2e^(-),),(,"(Oxidation half reaction)"),(Cu^(+2)(aq)+2e^(-)rarrCu,),(,"(Reduction half reaction)"):} Reason : Every redox reaction can be spilt into two reactions, one representing loss of electrons and the other representing gain of electrons.
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 :A

Discussion

27.	Assertion : Zonerefiningmethodisveryusefulfor producingsemiconductors. Reason: Semiconductors areofhighpurity.
Answer» Bothassertionandreason aretrueandreason is thecorrectexplanationofassertion. Both assertionandreasonaretruebutreasonis not thecorrectexplanationofassertion. Assertionistrue butreasonisfalse. Assertionis falsebutreasonistrue. SOLUTION :CORRECT EXPLANATION. Inthezonerefiningmethod,the meltis allowedto CRYSTALLIZE. Sinceimpurities are moresolubleinthemeltthan in thepurestateofthemetal,THEREFORE , ultrapuresemiconductormetalsare obtainedafter repeatedcrystallizations.

Discussion

28.	Assertion: Zn(OH)_(2) is dissolved in both NaH_(4)OH being basic can dissolve amphoteric Zn(OH)_(2).
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

29.	Assertion: Zn(OH)_(2) dissolves in an excess of NaOH solution as well as NH_(4)OH solution. Reason: Zn(OH)_(2) forms the soluble zincate salts with these alkalies.
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

30.	Assertion : Zn(OH)_(2) dissolve in an excess of an NaOH n solutionas well as NH_(4)OH solution Reasion : Zn(OH)_(2) formsthe soluble zincate salt in these alkline
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 Solution :Correct Reason (R ) `ZN(OH)_(2)` form the insoluble zincate salt with alkline `Zn(OH)_(2) + 2NaOH rarr UNDERSET("insoluble SODIUM zincate")(Na_(2)ZnO_(2))`

Discussion

31.	Assertion: Zn gives H_(2) gas with dil. HCl and also with dil. H_(2)SO_(4). Reason : In different medium, change in oxidation number shown by mangnese is altogether different.
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 :`Zn+underset("dil")(2HCl) to ZnCl_(2)+H_(2)(UARR)` `Zn+underset("dil")(H_(2)SO_(4)) to ZnSO_(4)+H_(2)(uarr)` `4Zn+underset("dil")(10HNO_(3)) to 4Zn(NO_(3))_(2)+N_(2)O+5H_(2)O`

Discussion

32.	Assertion : Zirconium can be purified by Van Arkel method. Reason : Zrl_4 is volatile and decomposes at 1800 K
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. Assertion is false but reason is true. ANSWER :A

Discussion

33.	Assertion : Zirconium can be purified by Van Arkel method. Reason : Zrl_(4) is volatile and decomposes at 1800 K.
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 false but reason is false. Assertion is false but reason is true. Solution :Reason is the correct explanation for Assertion.

Discussion

34.	Assertion: Zirconiumcan bepurifiedbyVan Arkelmethod.Reason:ZrI_4 isvolatileanddecomposesat1800 K.
Answer» Bothassertionandreason aretrueandreason is thecorrectexplanationofassertion. Both assertionandreasonaretruebutreasonis not thecorrectexplanationofassertion. Assertionistrue butreasonisfalse. Assertionis falsebutreasonistrue. SOLUTION :Bothassertionandreasonaretrueandreasonisthe correctexplanationofassertion.

Discussion

35.	Assertion : Zinc foils are used as wrappers for chocolates and chapatis. Reason : Ores which are magnetic in nature can be separated from non-magnetic impurities by magnetic separation.
Answer» Both A and R are CORRECT STATEMENT, and R is the correct explanation of the A. Both A and R are correct statement, but R is not the correct explanation of the A. Assertion is correct, but Reason is incorrect statement. Assertion is correct, but Reason is correct statement. Answer :D

Discussion

36.	Assertion: Zinc displaces copper from copper sulphate solution. Reason: The E^(@) of zinc is -0.76V and that of copper is +0.34V.
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. Answer :A

Discussion

37.	Assertion Zinc and iron decompose steam whereas copper and mercury do not. Reason A metal can displace hydrogen from wateronly if its reduction potential is less than that of hydrogen.
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 :A

Discussion

38.	Assertion: Zero and negative oxidation state of d-block metal ion are not possible in their complex compound. Reason: Low oxidation state of the metal ions are found when a complex compound has ligands capable of pi-aceptor character in addition to the sigma- bonding.
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 :In case of `pi`-acceptor ligands (like CO, NO) ZERO and negative oxidation state of d-block metal ion is possible DUE to phenomenon of Synergic BONDING.

Discussion

39.	Assertion : Zeolites are good shape-selective catalyst. Reason : Zeolotes have honeycomb like structures.
Answer» If both ASSERTION and REASON are TRUE and reasonis 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

40.	Assertion : Zeolites are extensively used in petrochemical industry. Reason : Zeolites are microporous, crystalline alumino silicates
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

41.	Assertion: Zeise's salt is a pi-bonded organometallic compound. Reason: Zeise's salt contain C_(2)H_(4) molecules as one of the ligand.
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 :C

Discussion

42.	Assertion. Xenon forms fluorides. Reason. Because 5d orbitals are available for valence shell expansion.
Answer» If both assertion and REASON are true, and reason is the correct explanation of the assertion. If both assertion and reason are ture, but reason is not the correct explanantion of the assertion. If assertion is true, but reason is false. If both assertion and reason are false Solution :Correct explanation. The IONIZATION energy of `F_(2)` is much HIGHER than that of Xe and 5d orbitals are available for valence shell EXPANSION.

Discussion

43.	Assertion : Xe-atom in XeF_(2) assumes sp-hybrid state. Reason : XeF_(2) molecule does not follow octet rule.
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 :B

Discussion

44.	Assertion : Wrought iron is purest form of iron with respect to other forms. Reason : It has less than 0.5% carbon.
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 :A

Discussion

45.	Assertion : Wrought iron is more malleable and ductile than steel. Reason : It contains slightly less percentage of carbon.
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

46.	Assertion : Wolf kishner and clemmensen's reagents both bring about the oxidation of aldehydes and ketones. Reason : Clemmensen's reagent is a powerful oxidising agent
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

47.	Assertion: Willkinson's catalyst contains Ti^(4+) as the metal cation Reason:Willkinson's catalyst has the composition[(C_6H_5)_3P]_3PhCl.
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

48.	Assertion: White ppt. of AgCl is soluble in NH_(4)OH Reason: It is due to the formation of soluble complex.
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. Answer :A

Discussion

49.	Assertion: When two gaseous OF molecules are allowed to cool, then they undergo dimerisation through O-atom. Reason: Dimerr form of OF molecule (i.e, O_(2)F_(2)) is having one peroxy linkage in its structure.
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

50.	Assertion : When two gaseous OF molecules are allowed to cool, than they undergoes dimerisation through O-atom. Reason : Dimer form of OF molecule (i.e., O_(2)F_(2)) is having one peroxy linkagein its structure.
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

Explore topic-wise InterviewSolutions in Current Affairs.

Assertion(A): Boiling point of ethanol is higher in comparison to methoxy methane. Reason (R): Ethanolis associated with inter molecular hydroxide bonding whereas in methoxy methane, inter molecular hydrogen bonding is not present.

Assertion(A): Bithional is added to soap as an antiseptic. Reason (R): Bithional is a sulpha drug and destroy bacteria.

Assertion(A): Benzoic acid does not undergo friedel crafts reaction. Reason (R): This is due to the strong deactivating nature of the carboxyl group

Assertion(A): Benzene is obviously an unsaturated hydrocarbon because it has for less hydrogen than the equivalent saturated hydrocarbon C_(6)H_(14), but benzene is too stable to be an alkene. Reason:Benzene is resonance stablised.

Assertion(A): Aspirin is an antipyretic and useful in the prevention of heart attacks. Reason (R): Aspirin reduces fever and also prevent platelet coagulation

Assertion(A): Aspirin has antipyretic properties. Reason (R): Aspirin gives relief from pain.

Assertion(A): Artificial sweeteners are added to the food to control the intake of calories. Reason (R): Most of the artificial sweeteners are inert and do not metabolise in the body.

Assertion(A) : Aromatic amines are less baisc than amonia. Reason (R):The Ione pair of electrons on nitrogen atom in aniline (aromatic amine) gets delocalised over the benzene ring and less available for protonation.

Assertion(A): Aqueous gold colloidal solution is red in colour. Reason(R): The colour arises due to scattering of light by colloidal gold particles.

Assertion(A): Aldehydes and ketones have high high boiling point as compared to hydrocarbon and ether of comparable molecular mass. Reason (R): It is due to weak molecular association in aldehydes and ketones arising out of the dipole - dipole interactions

Assertion(A): Alkanes can have an infinite number of conformations Reason(R ):In configurational isomeris,the isomers are distinct individuals substances.

Assertion(A): Alkyl amines are stronger base than Ammonia. Reason(R):When a+I group like alkyl group is attached to nitrogen increases the electron density on the nitrogen which makes the electron pair readily available for protonation.

Assertion(A): Aldehydes and ketones have high dipole moment. Reason (R): The carbonyl group of aldehydes and ketones contain a double bond between carbon and oxygen. Oxygen is more electronegative than carbon and it attracts the shared pair of electron which makes the carbonyl group as polar.

Assertion(A): Alcohols cannot be used as solvent for Grignard reagent. Reason (R): Alcohols are decomposed by Grignard reagents to give alkane.

Assertion(A): Acylation of amines gives a mono substituted product whereas alkylation of amines gives polysubstituted product. Reason(R): Acyl gropu sterically hindered the approach to further acyl group.

Assertion(A): Alcohols are dehydrated to hydrocarbons in the pressure of acidie zeolites. Reason(R): Zeolites are porous catalysts.

Assertion(A): Addition of sodium bisulphite finds application in the separation and purification of carbonyl compound. Reason (R): The bisulphite addition compound is water soluble and the solution is treated with mineral acid to regenerate the carbonyl compounds.

Assertion(A): Acetanilide is less basic than aniline. Reason(R): Acetylation of aniline results in the decrease of electron density on nitrogen.

Assertion(A): Acetaldehyde does not undergo cannizaro reaction. Reason (R): Cannizaro reaction is a characteristic of aldehyde having no alpha-H atom. Acetaldehyde contains 3 alpha -H atoms.

Assertion(A): Acetaldehyde and acetone are readily undergo aldol condensation reaction in the presence of dilute base.Reason (R): Aldehyde or ketone having a - hydrogen atom add together to give aldol or ketol.

Assertion(A): A reaction cannot become fast by itself unless a catalyst is added.

Assertion(A): A solution of bromine in C Cl_(4) is decolourised on passing acetylene gas through it. Reason Bromine is expelled from the solution by the acetylenegas.

Assertion(A): A disaccharide lactose act as reducing sugar. Reason (R): In lactose, beta - D galactoseand beta - D glucose are linked beta - 1, 4 - glycosidic bond in whichaldehyde group is not involved.

Assertion : Zone refining method is very useful for roducing semiconductors. Reason: Semiconductors are of high purity.

Assertion : Zone refining method is very useful for producing semiconductors. Reason : Semiconductors are of high purity .

Assertion : Zonerefiningmethodisveryusefulfor producingsemiconductors. Reason: Semiconductors areofhighpurity.

Assertion: Zn(OH)_(2) is dissolved in both NaH_(4)OH being basic can dissolve amphoteric Zn(OH)_(2).

Assertion: Zn(OH)_(2) dissolves in an excess of NaOH solution as well as NH_(4)OH solution. Reason: Zn(OH)_(2) forms the soluble zincate salts with these alkalies.

Assertion : Zn(OH)_(2) dissolve in an excess of an NaOH n solutionas well as NH_(4)OH solution Reasion : Zn(OH)_(2) formsthe soluble zincate salt in these alkline

Assertion: Zn gives H_(2) gas with dil. HCl and also with dil. H_(2)SO_(4). Reason : In different medium, change in oxidation number shown by mangnese is altogether different.

Assertion : Zirconium can be purified by Van Arkel method. Reason : Zrl_4 is volatile and decomposes at 1800 K

Assertion : Zirconium can be purified by Van Arkel method. Reason : Zrl_(4) is volatile and decomposes at 1800 K.

Assertion: Zirconiumcan bepurifiedbyVan Arkelmethod.Reason:ZrI_4 isvolatileanddecomposesat1800 K.

Assertion : Zinc foils are used as wrappers for chocolates and chapatis. Reason : Ores which are magnetic in nature can be separated from non-magnetic impurities by magnetic separation.

Assertion: Zinc displaces copper from copper sulphate solution. Reason: The E^(@) of zinc is -0.76V and that of copper is +0.34V.

Assertion Zinc and iron decompose steam whereas copper and mercury do not. Reason A metal can displace hydrogen from wateronly if its reduction potential is less than that of hydrogen.

Assertion: Zero and negative oxidation state of d-block metal ion are not possible in their complex compound. Reason: Low oxidation state of the metal ions are found when a complex compound has ligands capable of pi-aceptor character in addition to the sigma- bonding.

Assertion : Zeolites are good shape-selective catalyst. Reason : Zeolotes have honeycomb like structures.

Assertion : Zeolites are extensively used in petrochemical industry. Reason : Zeolites are microporous, crystalline alumino silicates

Assertion: Zeise's salt is a pi-bonded organometallic compound. Reason: Zeise's salt contain C_(2)H_(4) molecules as one of the ligand.

Assertion. Xenon forms fluorides. Reason. Because 5d orbitals are available for valence shell expansion.

Assertion : Xe-atom in XeF_(2) assumes sp-hybrid state. Reason : XeF_(2) molecule does not follow octet rule.

Assertion : Wrought iron is purest form of iron with respect to other forms. Reason : It has less than 0.5% carbon.

Assertion : Wrought iron is more malleable and ductile than steel. Reason : It contains slightly less percentage of carbon.

Assertion : Wolf kishner and clemmensen's reagents both bring about the oxidation of aldehydes and ketones. Reason : Clemmensen's reagent is a powerful oxidising agent

Assertion: Willkinson's catalyst contains Ti^(4+) as the metal cation Reason:Willkinson's catalyst has the composition[(C_6H_5)_3P]_3PhCl.

Assertion: White ppt. of AgCl is soluble in NH_(4)OH Reason: It is due to the formation of soluble complex.

Assertion: When two gaseous OF molecules are allowed to cool, then they undergo dimerisation through O-atom. Reason: Dimerr form of OF molecule (i.e, O_(2)F_(2)) is having one peroxy linkage in its structure.

Assertion : When two gaseous OF molecules are allowed to cool, than they undergoes dimerisation through O-atom. Reason : Dimer form of OF molecule (i.e., O_(2)F_(2)) is having one peroxy linkagein its structure.