94420 + Interview Questions in Chemistry in Class 12

1.	Assertion : Acid chlorides are preferably prepared from carboxylic acids with SOCl_(2) as chlorinating agents. Reason : with SOCl_(2), the products formed are gases which escape leaving the acid chloride in pure state.
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

2.	Assertion: Acidified [Cu(NH_(3))_(4)]^(2+) and [Cu(H_(2)O)_(4)]^(2+) both react with K_(4)[Fe(CN)_(6)] to give brown ppt. Reason: both complexes are blue in colour of little different shade.
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

3.	Assertion: Acetophenone and benzophenone can be distinguished by iodoform test. Reason: Acetophenone and benzophenone both are carbonyl compounds.
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 :ACETOPHENONE and benzophenone can be distinguished by iodoform TEST. Both are carbonyl compounds. Assertion and reason both are true but reason is not the CORRET explanation of assertion.

Discussion

4.	Assertion: Acetylene on treatment with alkaline KMnO_(4) produce acetaldehyde. Reason: Alkaline KMnO_(4) is a reducing agent.
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 :ACETYLENE, on treatment with alkaline `KMnO_(4)` is oxidised to PRODUCE oxalic acid. `{:(CH),(\|\|\|),(CH),("Acetylene"):}overset(4[O])UNDERSET(aln.KMnO_(4))RARR{:(COOH),(\|),(COOH),("Oxalic acid"):}` Therefore, both assertion and reason are false.

Discussion

5.	Assertion : Acetone is less reactive towards nucleophilic addition than acetaldehyde. Reason : The alkyl groups hinder the nucleophilic attack on carbonyl 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

6.	Assertion: Acetanilide is less basic than anilne. Reason: Acetylation of aniline results in decrease of electron density on nitrogen.
Answer» Both ASSERTION and reason are WRONG. Both assertion and reason are correct statements but reason is not correct EXPLANATION of assertion. Assertion is correct STATEMENT but reason is wrong statement. Both assertion and reason are correct statements and reason is correct explanation of assertion. Solution :Reason is the correct explanation of the assertion.

Discussion

7.	Assertion: Acetamide on reaction with KOH and bromine gives acetic acid. Reason: Bromine catalyses hydrolysis of acetamide.
Answer» if both assertion and reason are TRUE and reason is thecorrect EXPLANATION of assertion. if both assertion and reason are true but reason is not the CORRECT explanation of assertion. assertion is true but reason is false both assertion and reason are false Answer :D

Discussion

8.	Assertion : Acetamide on reaction with KOH and bromine gives acetic acid. Reason : Bromine catalyses hydrolysis of acetamide.
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 in not the correct explanation of assertion. assertion is true but reason is false both assertion and reason are false Answer :D

Discussion

9.	Assertion: Acetaldehyde on treatment with alkali gives aldol. Reason: Acetaldehyde molecules contains alpha hydrogen atom.
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 :Carbonyl compounds having `alpha`-hydrogen atom condenses to PRODUCE aldol in presence of ALKALI. `underset("Acetaldehyde")(CH_(3)-underset(O)underset(\|\|)(C)H+HCH_(2))CHO overset(dil. NaOH)rarrunderset("Aldol")(CH_(3)-underset(OH)underset(\|)(CH)-CH_(2))CHO`

Discussion

10.	Assertion: Acetamide has more polar gtC=O group than in ethyl acetoacetate. Reason: NH_(2) is more electron-donating than OC_(2)H_(5).
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

11.	Assertion : Acetaldehyde is more reactive than acetone in nucleophilic addition reactions. Reason Two alkyl groups in acetone reduce the electrophilicity of the 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. ANSWER :A

Discussion

12.	Assertion : Acetaldehyde gives haloform reaction Reason : Acetaldehyde contains CH_(3)-underset(O)underset(\|\|)(C)-"group".
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

13.	Assertion: According to transition state theory for the formation of an activated complex, one of the vibrational degree of freedom is converted into a transitional degree of freedom. Reason: Energy of the activated complex is higher than the energy of reactant molecules.
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 :Reason is the correct explanation for the assertion.

Discussion

14.	Assertion : Acetaldehydecan be prepared by addition of water to ethyne in the presence of H_(2)SO_(4) and HgSO_(4). Reason : Higher alkynes give higher aldehydes.
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 :HIGHER alkynes give ketones on additionof water in presence of `HgSO_(4) and H_(2)SO_(4).`

Discussion

15.	Assertion. According to transition state theory, for the formation of an activated complex, one of the vibrational degree of freedom is converted into a translational degree of freedom. Reason. Energy of the activated complex is higher than the energy of the reactant molecules.
Answer» If both ASSERTION and reason are true and reason is the true explanation of the assertion. If both assertion and reason ae 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 :`A+B to X^()to" Products"` The activated complex `X^()` has higher energy than reactants. It is a SPECIAL MOLECULE which decomposes such that one vibrational degree of freedom is CONVERTED into a translational degree of freedom along the reaction coordinate.

Discussion

16.	Assertion: According to transition state theory, for the formation of an activated complex, one of the vibrational degree of freedom is converted into a translation degree of freedom. Reason: Energy of the activated complex is higher than the energy of the reactant molecules.
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 the 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 :`A + B rarr X^() rarr` Products The activated complex `X^()` has HIGHER energy than reactants. It is a special molecule which decomposes such that one vibrational degree of FREEDOM is CONVERTED into a translational degree of freedom along the reaction coordinate.

Discussion

17.	Assertion: According to the transition state theory, for the formation of an activated complex, one of the vibrational degree of freeedom is converted into the transition degree of freedom. Reason: The energy of the activated complex is higher than the energy of the reactant molecules.
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 the 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 :`A + B rarr X^() rarr` Products The activated complex `X^()` has higher energy than reactants. It is a special molecule which decomposes such that one VIBRATIONAL degree of freedom is converted into a translational degree of freedom along the reaction cooradiante.

Discussion

18.	Assertion : According to Le-Chatelier's -principle addition of heat to an equilibrium solid = liquid results in decrease in the amount of solid. Reason : Reaction is endothemic, so on heating forward reaction is fovoured.
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 :Solid + heat= liquid So on the heating forward reaction is FAVOURED and amount of solid will decrease.

Discussion

19.	Assertion: According to Le-Chatelier's principle addition of heat to an equilibrium solid liquid results in decrease in the amount of solid. Reason: Reaction is endothermic, so on heating forward reaction is favoured.
Answer» If both ASSERTION and REASON are TREU 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. ANSWER :A

Discussion

20.	Assertion: According to Kohlrausch's law the molar conductivity of a strong electrolyte at infinite dilution is sum of molar conductivities of its ions. Reason: The current carried by cation and anion is always equal.
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 reason is the current carried by cation and anion is EQUAL to their transport number.

Discussion

21.	Assertion: According to Kahlrausch law, the molar conductivity fo a strong electrolyte at infinite dilution is sum of molar conductivities of its ions.
Answer» If both assertion and reason are true, and reason is the true EXPLANATION of the assertion if both assertion and reason are true, but reason is not the true explanation of the assertion. if assertion is true, but reason is false. If both assertion and reason are false. Solution :Correct A. The molar conductivity of any ELECTROLYTE (weak or strong) at infinite dilution is sum of molar conductivities of the ions multiplied by the respective number of ions in one formula unit. Correct R. the CURRENT carried by CATIONS and anions is not equal.

Discussion

22.	Assertion : Absorption spectrum consistsof some bright lines separated by dark spaces . Reason : Emission spectrum consists of dark lines.
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 :Absorption spectrum is produced when white light is passed through a substanceand transmitted light is analysed by a spectrograph .Thedark spacescorresponds to the light RADIATION absorbed by the substance . And emission spectrum is produced by ANALYSING the radiant energy emitted by an excited substance by a spectrograph . Thus discontinuous spectra consistingof a series of sharp LINES and separated by darkbands are obtained.

Discussion

23.	Assertion : According to Bronsted concept, H_2O is an a neutral substance. Reason : H_2O molecules can accept as well as donate a proton .
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

24.	Assertion :- Absolute value of enthalpy can not be determined. Reason :- Enthalpy is defined as H = E + PV, and value of internal energy can not be determined absolutely therefore absolute value of enthalpy can not be determined.
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

25.	(A) Absolute electrode potential can be easily measured by using vacuum tube voltmeter. (R ) Oxidation or reduction cannot take place alone,
Answer» Both A and R are TRUE and R is the CORRECT EXPLANATION of A Both A and R are true but R is not a correct explanation of A A is true but R is false Both A and R arefalse. Answer :D

Discussion

26.	Assertion (A):Aluminium is used in the design of chemical reactors. Reason (R ):Aluminium has high resistance to corrosion
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 :a

Discussion

27.	Assertion [A]:All collision of reactant molecules lead to product formation. Reason [R]:Only those collisions in which molecules have correct orientation and sufficient kinetic energy lead to compound formation.
Answer» Both ASSERTION [A] and reason [R] are correct and the reason [R] is correct explanation of assertion [A]. Both assertion [A] and reason [R] are correct but reason [R] does not explain assertion [A] Assertion [A] is correct but reason [R] is correct Assertion [A] is incrorrect but reason [R] is correct. Solution :Not every union between the processed atoms is CONVERTED into a FERTILIZER so that the statement is wrong. Effective consortium can the same amount of energy that is formed between the RIGHT SPACE and atoms with sufficient dense energy.

Discussion

28.	Assertion (A):A suitable reducing agent is selected based on the thermdynamic consideration. Reason (R ):The reduction of metal oxide with a given reducing agent can occur if the free energy change fot the coupled reaction is positive.
Answer» A and R are correct mR 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 :C

Discussion

29.	Assertion (A) : Zinc oxide is colourless at room temperature but on heating it becomes yellow in colour. Reason (R) : On heating Zinc loses oxygen and thereby forming free Zn^(2+) ions. The excess Zn^(2+) ions move to interstitial sites and the electrons also occupy interstitial positions.
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 the correct explanation of A A is correct but R is WRONG A is wrong but R is correct SOLUTION :Both A and R are correct and R is the correct explanation of A.

Discussion

30.	Assertion (A) : Zone refining is carried out in an inert gas atmosphere. Reason : The metal is treated with a suitable reagent which can form a volatile compound with the metal.
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

31.	Assertion (A) : Zinc, cadmium and mercury are not accepted as transition metal elements. Reason (R) : Zinc, cadmium and mercury have full d^(10) configuration in their ground state as well as in their common oxidation states.
Answer» Both ASSERTION (A) and REASON (R) are CORRECT statements, and Reason (R) is the correct explanation of the Assertion (A). Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A). Assertion (A) is correct, but Reason (R) is incorrect STATEMENT. Assertion (A) is incorrect, but Reason (R) is correct statement. Answer :A

Discussion

32.	Assertion (A): Zieglar.Natta catalyst is used for the manufacture of low density polythene. Reason (R) : Teflon is used in making non-stick utensils.
Answer» Both ASSERTION (A) and Reason (R) are CORRECT STATEMENTS, and Rerson (R) is the correct explanation of the Assertion (A) Both Assertion (A) and Reson (R) are correct statements, but Reson (R) is not the correct explanation of the Assertion (A) Assertion (A) is correct, but Reason (R) is incorrect statement. Assertion (A) is incorrect, but Reason (R) is correct statement. Answer :D

Discussion

33.	Assertion (A) : Xenon is used in high speed electronic flash bubls used by photographers. Reason (R ): Xenon emits an intense light in discharge tubes instantly.
Answer» A are R are CORRECT and R EXPLAINS A A and R are correct but doesn't explains A A is correct but R is wrong A is wrongbut R is correct Solution :A are R are correct and R explains A

Discussion

34.	Assertion : A white turbidity is obtained by passing H_(2)S through aq solution of SO_(2) Reason: Aq solution of SO_(2) and H_(2)S undergoes redox change to produce colloidal sulphur
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

35.	Assertion (A): Zeolites act as a molecular sieve. Reason(R):Zeolite structure is pore/ channel sizes are nearly uniform.
Answer» (a) A and R are CORRECT and R EXPLAINS A. (B) A and R are correct and R not explains A. (c) A is correct but R is wrong. (d) A is wrong but R is correct. Answer :A

Discussion

36.	Assertion: A white precipitate is obtained when an aq solution of sodium thiosuphate is treated with AgNO_(3) solution and if the precipitate is heated with water, a black precipitate is obtained, and the supernatent liquid then gives a white precipitate with BaCl_(2) solution. Reason: Ag^(+) ion forms a complex withn thiosulphate ions which upon hydrolysis undergoes disproportionation to yield SO_(4)^(2-) ion(supernatent liquid) and Ag_(2)S (black precipitate)
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

37.	Assertion (A) : Whenthe bodyneeds glucose ,enzymes break the glycogendown the glucose. Reason(R) :Honeyhas been used fora longtime as an instantsource of energy
Answer» Both Assertion (A) and REASON (R) are correct statementand Reason (R) is the correctexplanationof the Assertion (A). Both Assertion (A) and Reason (R) are CORRECTSTATEMENTS, but Reason(R) is NOTTHE CORRECTEXPLANATION of the Assertion (A). Assertion (A) is correct, but Reason(R) is INCORRECT statement Assertion (A) is incorrect , but Reason (R) is correct statement. Answer :B

Discussion

38.	Assertion (A) : Whenever half-filled or fully filled configuration of the metal is disturbed after removing the electrons, a high value of I.E. is observed. Reason (R) : Paramagnetic substances are repelled by the magnetic field where as diamagnetic substances are attracted by the magnetic field.
Answer» Both ASSERTION (A) and Reason (R) are CORRECT statements, and Reason (R) is the correct explanation of the Assertion (A). Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A). Assertion (A) is correct, luut Reason (R) is incorrect statement. Assertion (A) is incorrect, but Reason (R) is correct statement Answer :C

Discussion

39.	Assertion (A) : When KBr is heated with conc. H_2SO_4, HBr is displaced. Reason (R) :HBr is a weaker acid than conc. H_2SO_4.
Answer» Both A and R true and R is the CORRECT explanation of A Both A and R true and R is not acorrect explanation of A A is true but R is false Both A and R are false Solution :Assertion. When KBR is heated with conc. `H_2SO_4, Br_2` is produced. REASON. Conc. `H_2SO_4` oxidised HBr produced to `Br_2`.

Discussion

40.	Assertion (A) : When NaCl(s) is heated with conc. H_2SO_4, Cl_2 is produced. Reason (R) :Conc. H_2SO_4 oxidises the HCl produced toCl_2.
Answer» Both A and R true and R is the CORRECT explanation of A Both A and R true and R is not acorrect explanation of A A is true but R is false A is false but R is true Solution :When NACL(s) is heated with CONC. `H_2SO_4`, HCl is produced. Conc. `H_2SO_4` cannot oxidise HCl to `Cl_2`.

Discussion

41.	Assertion (A) : When KI is heated with conc. H_2SO_4, I_2 and not HI is produced. Reason (R) :Conc. H_2SO_4 is a strong oxidising agent and as such oxidises the HI produced.
Answer» Both A and R true and R is the correct EXPLANATION of A Both A and R true and R is not acorrect explanation of A A is true but R is FALSE A is false but R is true Solution :Both assertion (A) and REASON (R) are true and R is the correct explanation of A.

Discussion

42.	Assertion (A): When HCl reacts with finely powdered Iron It forms ferrous chloride but not ferric chloride Reason R: Liberation of Hydrogen prevents the formation of ferric chloride
Answer» A & R are TRUE, R is CORRECT EXPLANATION of A A & R are true, R is not correct explanation of A A is true, but R is false A is false, but R is true Solution :Conceptual

Discussion

43.	Assertion (A) : When a test tube containing sulphur (m.p. 387.5 K) at 455 K is inverted, nothing comes out. Reason(R) :Molten sulphur when come in contact with airburns instantly to give SO_2
Answer» Both A and R TRUE and R is the correct explanation of A Both A and R true and R is not acorrect explanation of A A is true but R is false A is false but R is true Solution :REASON. At about 455 K, molten sulphur suddenly becomes so viscous that nothing pours out when the test tube is inverted.

Discussion

44.	Assertion (A) : Water vapours are adsorbed by anhydrous CaCl_2 but absorbed by silica gel. Reason (R) : The accumulation of molecular species at the surface rather than in the bulk of solid or liquid is called adsorption.
Answer» Both ASSERTION (A) and REASON (R) are CORRECT statements, and Reason (R) is the correct EXPLANATION of the Assertion (A). Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A) Assertion (A) is correct, but Reason (R) is incorrect statement. Assertion (A) is incorrect, but Reason (R) is correct statement ANSWER :D

Discussion

45.	Assertion (A) : Vitamin D can be stored in our body. Reason (R) : Vitamin D is fat-soluble vitamin.
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 :Assertion and reason both are correct statements and reason explains the assertion.

Discussion

46.	Assertion (A) : VitaminD canbe stored in our body. Reason (R) :Vitamin Dis fat soluble vitamin.
Answer» A is correct but R not explains A . BOTHA and Rare correctand RexplainA . AIS correctbut RIS wrong . A is wrong but R is correct . ANSWER :B

Discussion

47.	Assertion : A very dilute acidic solution of Cd^(2+) and Ni^(2+) gives yellow ppt. of CdS on passing H_(2)S. Statement: Solubility product of CdS is more than that of NiS.
Answer» Both ASSERTION and statement are TRUE and statement is an explanation of assertion Assertion is correct and statement is WRONG, statement is not an explanation of assertion Assertion is wrong and statement is correct, statement is not an explanation of assertion Both assertion and statement are wrong and statement is not an explanation of assertion Answer :B

Discussion

48.	Assertion (A) : Valence bond theory does not give quantitative interpretation of magnetic data. Reason (R) : A compound is paramagnetic if it contains unpaired electrons.
Answer» Both Assertion (A) and Reason (R) are correct STATEMENTS, and Reason (R) is TIRE correct EXPLANATION of the Assertion (A). Both Assertion (A) and Reason (R) are correct statements,, but Reason (R) is not the CORRET explanation of the Assertion (A). Assertion (A) is correct, but Reason (R) is incorrect statement. Assertion (A) is incorrect, but Reason (R) is correct statement. Answer :B

Discussion

49.	Assertion (A) : V_(2)O_(5) catalyst is used in Haber's process for the manufacture of ammonia. Reason (R) : The principal oxidation state for lanthanoids is +3 although +2 and +4 oxidation states are also exhibited.
Answer» Both ASSERTION (A) and REASON (R) are CORRECT statements, and Reason (R) is the correct explanation of the Assertion (A). Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A). Assertion (A) is correct, but Reason (R) is incorrect statement. Assertion (A) is incorrect, but Reason (R) is correct statement. Answer :D

Discussion

50.	Assertion (A) : Unit of rate constant for a zero order reaction is "mol"^(-1)L s^(-1). Reason (R ) : Trimolecular reactions involve simultaneous collision between three reacting species.
Answer» Both Assertion (A) and REASON (R ) are correct statements, and Reason (R ) is the correct explanation of the Assertion (A). Both Assertion (A) and Reason (R ) are correct statements, but Reason (R ) is not the correct explanation of the Assertion (A). Assertion (A) is correct, but Reason (R ) is INCORRECT STATEMENT. Assertion (A) is incorrect, but Reason (R ) is correct statement. Answer :D

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Assertion : Acid chlorides are preferably prepared from carboxylic acids with SOCl_(2) as chlorinating agents. Reason : with SOCl_(2), the products formed are gases which escape leaving the acid chloride in pure state.

Assertion: Acidified [Cu(NH_(3))_(4)]^(2+) and [Cu(H_(2)O)_(4)]^(2+) both react with K_(4)[Fe(CN)_(6)] to give brown ppt. Reason: both complexes are blue in colour of little different shade.

Assertion: Acetophenone and benzophenone can be distinguished by iodoform test. Reason: Acetophenone and benzophenone both are carbonyl compounds.

Assertion: Acetylene on treatment with alkaline KMnO_(4) produce acetaldehyde. Reason: Alkaline KMnO_(4) is a reducing agent.

Assertion : Acetone is less reactive towards nucleophilic addition than acetaldehyde. Reason : The alkyl groups hinder the nucleophilic attack on carbonyl carbon atom.

Assertion: Acetanilide is less basic than anilne. Reason: Acetylation of aniline results in decrease of electron density on nitrogen.

Assertion: Acetamide on reaction with KOH and bromine gives acetic acid. Reason: Bromine catalyses hydrolysis of acetamide.

Assertion : Acetamide on reaction with KOH and bromine gives acetic acid. Reason : Bromine catalyses hydrolysis of acetamide.

Assertion: Acetaldehyde on treatment with alkali gives aldol. Reason: Acetaldehyde molecules contains alpha hydrogen atom.

Assertion: Acetamide has more polar gtC=O group than in ethyl acetoacetate. Reason: NH_(2) is more electron-donating than OC_(2)H_(5).

Assertion : Acetaldehyde is more reactive than acetone in nucleophilic addition reactions. Reason Two alkyl groups in acetone reduce the electrophilicity of the carbon.

Assertion : Acetaldehyde gives haloform reaction Reason : Acetaldehyde contains CH_(3)-underset(O)underset(||)(C)-"group".

Assertion: According to transition state theory for the formation of an activated complex, one of the vibrational degree of freedom is converted into a transitional degree of freedom. Reason: Energy of the activated complex is higher than the energy of reactant molecules.

Assertion : Acetaldehydecan be prepared by addition of water to ethyne in the presence of H_(2)SO_(4) and HgSO_(4). Reason : Higher alkynes give higher aldehydes.

Assertion. According to transition state theory, for the formation of an activated complex, one of the vibrational degree of freedom is converted into a translational degree of freedom. Reason. Energy of the activated complex is higher than the energy of the reactant molecules.

Assertion: According to transition state theory, for the formation of an activated complex, one of the vibrational degree of freedom is converted into a translation degree of freedom. Reason: Energy of the activated complex is higher than the energy of the reactant molecules.

Assertion: According to the transition state theory, for the formation of an activated complex, one of the vibrational degree of freeedom is converted into the transition degree of freedom. Reason: The energy of the activated complex is higher than the energy of the reactant molecules.

Assertion : According to Le-Chatelier's -principle addition of heat to an equilibrium solid = liquid results in decrease in the amount of solid. Reason : Reaction is endothemic, so on heating forward reaction is fovoured.

Assertion: According to Le-Chatelier's principle addition of heat to an equilibrium solid liquid results in decrease in the amount of solid. Reason: Reaction is endothermic, so on heating forward reaction is favoured.

Assertion: According to Kohlrausch's law the molar conductivity of a strong electrolyte at infinite dilution is sum of molar conductivities of its ions. Reason: The current carried by cation and anion is always equal.

Assertion: According to Kahlrausch law, the molar conductivity fo a strong electrolyte at infinite dilution is sum of molar conductivities of its ions.

Assertion : Absorption spectrum consistsof some bright lines separated by dark spaces . Reason : Emission spectrum consists of dark lines.

Assertion : According to Bronsted concept, H_2O is an a neutral substance. Reason : H_2O molecules can accept as well as donate a proton .

Assertion :- Absolute value of enthalpy can not be determined. Reason :- Enthalpy is defined as H = E + PV, and value of internal energy can not be determined absolutely therefore absolute value of enthalpy can not be determined.

(A) Absolute electrode potential can be easily measured by using vacuum tube voltmeter. (R ) Oxidation or reduction cannot take place alone,

Assertion (A):Aluminium is used in the design of chemical reactors. Reason (R ):Aluminium has high resistance to corrosion

Assertion [A]:All collision of reactant molecules lead to product formation. Reason [R]:Only those collisions in which molecules have correct orientation and sufficient kinetic energy lead to compound formation.

Assertion (A):A suitable reducing agent is selected based on the thermdynamic consideration. Reason (R ):The reduction of metal oxide with a given reducing agent can occur if the free energy change fot the coupled reaction is positive.

Assertion (A) : Zinc oxide is colourless at room temperature but on heating it becomes yellow in colour. Reason (R) : On heating Zinc loses oxygen and thereby forming free Zn^(2+) ions. The excess Zn^(2+) ions move to interstitial sites and the electrons also occupy interstitial positions.

Assertion (A) : Zone refining is carried out in an inert gas atmosphere. Reason : The metal is treated with a suitable reagent which can form a volatile compound with the metal.

Assertion (A) : Zinc, cadmium and mercury are not accepted as transition metal elements. Reason (R) : Zinc, cadmium and mercury have full d^(10) configuration in their ground state as well as in their common oxidation states.

Assertion (A): Zieglar.Natta catalyst is used for the manufacture of low density polythene. Reason (R) : Teflon is used in making non-stick utensils.

Assertion (A) : Xenon is used in high speed electronic flash bubls used by photographers. Reason (R ): Xenon emits an intense light in discharge tubes instantly.

Assertion : A white turbidity is obtained by passing H_(2)S through aq solution of SO_(2) Reason: Aq solution of SO_(2) and H_(2)S undergoes redox change to produce colloidal sulphur

Assertion (A): Zeolites act as a molecular sieve. Reason(R):Zeolite structure is pore/ channel sizes are nearly uniform.

Assertion (A) : Whenthe bodyneeds glucose ,enzymes break the glycogendown the glucose. Reason(R) :Honeyhas been used fora longtime as an instantsource of energy

Assertion (A) : Whenever half-filled or fully filled configuration of the metal is disturbed after removing the electrons, a high value of I.E. is observed. Reason (R) : Paramagnetic substances are repelled by the magnetic field where as diamagnetic substances are attracted by the magnetic field.

Assertion (A) : When KBr is heated with conc. H_2SO_4, HBr is displaced. Reason (R) :HBr is a weaker acid than conc. H_2SO_4.

Assertion (A) : When NaCl(s) is heated with conc. H_2SO_4, Cl_2 is produced. Reason (R) :Conc. H_2SO_4 oxidises the HCl produced toCl_2.

Assertion (A) : When KI is heated with conc. H_2SO_4, I_2 and not HI is produced. Reason (R) :Conc. H_2SO_4 is a strong oxidising agent and as such oxidises the HI produced.

Assertion (A): When HCl reacts with finely powdered Iron It forms ferrous chloride but not ferric chloride Reason R: Liberation of Hydrogen prevents the formation of ferric chloride

Assertion (A) : When a test tube containing sulphur (m.p. 387.5 K) at 455 K is inverted, nothing comes out. Reason(R) :Molten sulphur when come in contact with airburns instantly to give SO_2

Assertion (A) : Water vapours are adsorbed by anhydrous CaCl_2 but absorbed by silica gel. Reason (R) : The accumulation of molecular species at the surface rather than in the bulk of solid or liquid is called adsorption.

Assertion (A) : Vitamin D can be stored in our body. Reason (R) : Vitamin D is fat-soluble vitamin.

Assertion (A) : VitaminD canbe stored in our body. Reason (R) :Vitamin Dis fat soluble vitamin.

Assertion : A very dilute acidic solution of Cd^(2+) and Ni^(2+) gives yellow ppt. of CdS on passing H_(2)S. Statement: Solubility product of CdS is more than that of NiS.

Assertion (A) : Valence bond theory does not give quantitative interpretation of magnetic data. Reason (R) : A compound is paramagnetic if it contains unpaired electrons.

Assertion (A) : V_(2)O_(5) catalyst is used in Haber's process for the manufacture of ammonia. Reason (R) : The principal oxidation state for lanthanoids is +3 although +2 and +4 oxidation states are also exhibited.

Assertion (A) : Unit of rate constant for a zero order reaction is "mol"^(-1)L s^(-1). Reason (R ) : Trimolecular reactions involve simultaneous collision between three reacting species.