94420 + Interview Questions in Chemistry in Class 12

1.	Assertion (A) : Methyl cyanide has higher boiling point than methyl isocyanide. Reason (R ) : Dipole moment of methyl cyanide is higher than that of methyl iso cyanide.
Answer» (A) and (R ) are true and (R ) is the correct EXPLAINATION 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 (A) : Metallurgy of Ag from argentite is known as hydro-metallurgy. Reason (R ) : Argentite is Ag_(2)S.
Answer» Both (A) and (R ) are TRUE and (R ) is the CORRECT EXPLANATION of (A). Both (A) and (R ) are true and (R ) is not the correct explanation of (A). (A) true but (R ) false. Both (A) and (R ) are false. Answer :B

Discussion

3.	Assertion (A) : Metallic zinc is used in galvanising metals such as iron and steel. Reason (R ) : Zinc is also used to produce die castings.
Answer» Both (A) and (R ) are TRUE and (R ) is the CORRECT EXPLANATION of (A). Both (A) and (R ) are true and (R ) is not the correct explanation of (A). (A) true but (R ) false. Both (A) and (R ) are false. Answer :B

Discussion

4.	Assertion (A): MeMgBr should be preapared under perfectlyanhydrous conditions. Reason (R):Grinardreagent reacts with water.
Answer» Both `(A)` and `(R)` are true and `(R0` is the correct EXPLANATION of `(A)`. Both `(A)` and `(R)` are true but `(R)` is not the correct explanation of `(A)`. `(A) is true but `(R)` is FALSE. `(A) is falsebut `(R)` is true. Solution :NA

Discussion

5.	Assertion (A): Melamine and acetaldehyde are the monomers for the preparation of melamine polymers. Reason (R) Butadiene-styrene copolymer is quite tough and is a good substitute for natural rubber.
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

6.	Assertion (A) : Many gemstones are impure form of Al_(2)O_(3). Reason (S) : A downward stream of running water is used in hydraulic washing.
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. A is correct, but the R is INCORRECT statement. A is incorrect, but the R is correct statement. Answer :C

Discussion

7.	Assertion (A): Maltose is obtained by the hydrolysis of sucrose. Reason (R) : Citrus fruits and green leafy vegetables contain vitamin C.
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 :D

Discussion

8.	Assertion (A) : Lyphobic colloids are solvent loving and are prepared by direct mixing of the dispersed phase in dispersion medium. Reason (R) : Substances that enhance the activity of catalyst are called promotars.
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

9.	Assertion (A) : Lyophobic sols are more stable than lyophilic sols. Reason (R) : The process of settling colloidal particles is called coagulation.
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

10.	Assertion (A): Lyophobic colloids like sols of gold will precipitate readily. Reason (R) : In lyophobic colloids, no attractive force exists between the dispersed phase and dispersion medium and are less stable.
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. Both A and R are correct. A is correct but R is wrong. Answer :A

Discussion

11.	Assertion (A): Lyophillic colloids will not get precipitated easily. Reason (R) : In lyophillic colloids, definite attractive forces exists between dispersion medium and dispersed phase and they are more stable.
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. Both A and R are wrong. A is correct but R is wrong. Answer :A

Discussion

12.	Assertion (A): Low spin tetrahedral complexes are rarely observed. Reason(R ): Crystal field splitting energy is less than pairing energy for tetrahedral complexes.
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 :B

Discussion

13.	Assertion (A) : Low spin tetrahedral complexes are rarely observed. Reason (R ) : The orbital splitting energies are not sufficiently large to forcing pairing
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 :B

Discussion

14.	Assertion (A) : Linkage isomerism is studied under stereoisomerism. Reason (R) : The names of coordination compounds are derived by following the principles of additive nomenclature.
Answer» Both Assertion (A) and REASON (R) are CORRECT STATEMENTS, and Reason (R) is the correct EXPLATION of the Assertion (A). Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explation 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

15.	Assertion (A) : Linkage isomerism arises in a coordination compound containing ambidentate ligand. Reason (R) : Coordination isomerism arises from the interchange of ligands between cationic and anionic entities of different metal ions present in the complex.
Answer» Both ASSERTION (A) and Reason (R) are CORRECT statements, and Reason (R) is the correct EXPLATION of the Assertion (A). Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explation 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

16.	Assertion (A) : Linkage isomerism arises in coordination compounds because of ambidentateligand. Reason (R ) : Ambidentate ligand like NO_(2) has two different donor atoms i.e., N and O.
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 ASSERITON (A). Assertion (A) is correct, but Reason (R ) is incorrect STATEMENT. Assertion (A) is incorrect, but Reason (R ) is correct statement. ANSWER :A

Discussion

17.	Assertion (A): Like bromination of benzene bromination of phenol is also carried out in presence of Lewis acid. Reason (R) : Lewis acid polarises bromine molecule.
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 :Bromination of phenol can be CARRIED out in absence of LEWIS acid.

Discussion

18.	Assertion (A): Latex is a colloidal solution of rubber in water. Reason (R) : Natural rubber may be considered as a linear polymer of isoprene.
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 :B

Discussion

19.	Assertion: A large dry cell has high e.m.f. Reason: The e.m.fof a dry cell is proportional to its size.
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 :D

Discussion

20.	Assertion (A) : Kohlrausch law states that limiting molar conductivity of an electrolyte can be represented as the difference of individual contributions of the anion and the cation. Reason (R): A cell in which an external source of voltage is used to bring about a chemical reaction is called electrolytic solution.
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

21.	Assertion (A) : IUPAC name of the compound is 2-ethoxy-2-methylethane CH_(3)- underset(CH_(3))underset(\|)CH-O-CH_(2)- CH_(2)- CH_(3) Reason (R) : In IUPAC nomenclature, ether is regarded as hydrocarbon derivative in which a hydrogen atom is replaced by -OR or -OAr group. [R = alkyl group, Ar = aryl group]
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 :`to` The IUPAC name of the compound is 2-propoxypropane

Discussion

22.	Assertion (A) : KCN reacts with methyl chloride to give methyl isocyanide.Reason (R ) : CN^(-) is an ambident nucleophile.
Answer» Assertion and reason both are correct and reason is correct EXPLANATION of assertion. Assertion and reason both are WRONG statements. Assertion is correct but reason is wrong STATEMENT. Assertion is wrong but reason is correct statement. SOLUTION :KCN reacts with METHYL chloride to form methylcyanide predominanently.

Discussion

23.	Assertion (A) : IUPAC name of ethanamine is ethylamine. Reason (R) : In IUPAC system, C_(6)H_(5)-NH_(2) is named as benzenamine.
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

24.	Assertion (A) : It is difficult to replace chlorine by - OH in chlorobenzene in comparison to that in chloroethane.Reason (R ) : Chlorine - carbon (C - Cl) bond in chlorobenzene has a partial double bond character due to resonance.
Answer» Assertion and reason both are CORRECT and reason is correct EXPLANATION of assertion. Assertion and reason both are WRONG statements. Assertion is correct but reason is wrong STATEMENT. Assertion is wrong but reason is correct statement. Solution :

Discussion

25.	Assertion (A): Iron colloid cannot be prepared by Bredig's are method. Reason (R): Iron cannot react with alkali hydroxide stabilising agent added in water.
Answer» Both A and R are CORRECT and R is the correct EXPLANATION of A. A is correct but R is WRONG. A is wrong but R is correct. Both A and R are wrong. Answer :A

Discussion

26.	Assertion (A) : Ions of the same charge in a given series show progressive decrease in radius with increasing atomic number. Reason (R) : The new electron enters a d-orbital each time the nuclear charge increases by unity.
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

27.	Assertion (A) : Industrially, sulphur dioxide is produced as a byproduct of roasting of sulphide ores. Reason (R) : In the reaction of SO_2 with water and alkalies, the behaviour of SO_2 is very similar to that of CO_2.
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 Renson (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 :C

Discussion

28.	Assertion (A) : Ionic solids do not conduct electricity in solid state but in molten state they conduct electricity. Reason (R) : In solid state, the ions are fixed in their lattice positions but in molten state, the ions are free to move and conduct electricity
Answer» 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. 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

29.	Assertion (A): In transition metal series, the ionization enthalpy increases. Reason (R): This is due to increase in nuclear charge corresponding to the filling of d electrons.
Answer» Both (A) and (R) are CORRECT and (R) EXPLAINS (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) explains (A).

Discussion

30.	Assertion (A) : In the complex ions [Fe(C_(2)O_(4))_(3)]^(3-), the coordination number of Fe is six. Reason (R) : Complexes in which a metal is bound to only one kind of groups are called hornoleptic.
Answer» Both ASSERTION (A) and Reason (R) are correct STATEMENTS, and Reason (R) is the correct explation of the Assertion (A). Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explation 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

31.	Assertion (A) : In the complex ion [PtCl_(6)]^(2-), the coordination number of Pt is 6. Reason (R) : Both double salts as well as complexes are formed by the combination of two or more stable compounds in stoichiometric ratio.
Answer» Both Assertion (A) and REASON (R) are correct statements, and Reason (R) is the correct explation of the Assertion (A). Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explation 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 :C

Discussion

32.	Assertion (A): In the case of optically active alkyl halide, the product formed as a result of S_(N)2 mechanism has the inverted configuration as compared to the reactant.Reason (R) In S_(N)2 mechanism, the nucleophile attaches itself on the side opposite to the one where the halogen is present resulting in inversion in configuration of the product.
Answer» Both Assertion (A) and Resort (R) are correct statements, QUID Reason (R) is the correct explanation of the Assertion (A). Both Assertion (A) and Reason (R) are correct statements, BRIT 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 Renson (R) is correct statement. Answer :a

Discussion

33.	Assertion (A) : In presence of enzymes, substrate molecule can be attacked by the reagent effectively. Reason (R) : Active sites of enzymes hold the substrate molecule in a suitable position.
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

34.	Assertion (A) In presence of enzyme, substrate molecule can be attacked by the reagent effectively. Reason (R) Active sites of enzymes hold the substrate molecule in a suitable position.
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

35.	Assertion (A) : In order to convert R-Cl to pure R-NH_(2) Gabriel Phthalimide synthesis can be used. Reason (R) : Phthalimide synthesis can be used to prepare pure 1^(@) or 2^(@) or 3^(@) amines separately with proper choice of alkyl halide.
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. A is false but R is false. Answer :C

Discussion

36.	Assertion (A) : In K_(4)[Fe(CN)_(6)], the coordination number is six. Reason (R ) : The number of sigma bonds between ligands and the central metal atom is known as coordination number.
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 Answer :A

Discussion

37.	Assertion (A) : In monohaloarenes, further electrophilic substitution occurs at ortho and para positions.Reason (R ). Halogen atom is a ring deactivator.
Answer» ASSERTION and REASON both are CORRECT and reason is correct EXPLANATION of assertion. Assertion and reason both are wrong statements. Assertion is correct but reason is wrong statement. Assertion and reason both are correct statements but reason is not correct explanation of assertion. Solution :o - and p - DIRECTING effect is due to resonance.

Discussion

38.	Assertion (A) : In Daniel cell, the salt bridge contains an agar-agar gel mixed with an inert electrolyte KCl (or) Na_2SO_4 Reason (R) : The ions of inert electrolyte do not react with other ions present in half cells and they are not either oxidised or reduced at electrodes.
Answer» Both A and R are CORRECT Both A and R are WRONG A is correct but R is wrong A is wrong but R is correct ANSWER :A

Discussion

39.	Assertion (A) : In H_(2) Cl_(2) and I_(2), the atoms or molecules are held by weak dispersion forces. Reason (R) : Diamond and silicon carbide are examples of ionic solids.
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 :C

Discussion

40.	Assertion (A): IN comparison to C_(2) H_(5)Br, it is difficultto carry out SN reaction o vinylbromide. Reason (R):Vinyl groupis electrondonating.
Answer» Both `(A)` and `(R)` are true and `(R0` is the correct explanation of `(A)`. Both `(A)` and `(R)` are true but `(R)` is not the correct explanation of `(A)`. `(A) is true but `(R)` is false. `(A) is falsebut `(R)` is true. Solution :Correct REASON: `(C-X)` bond has some double bond character.

Discussion

41.	Assertion (A) : In bcc, the available volume is more efficiently used than in simple cubic packing. Reason (R) : In simple cubic arrangement, the number of spheres belongs to a unit cell is equal to one whereas in bcc, it is equal to 2.
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

42.	Assertion (A) : In a reversible endothermic reaction, E_("act") of forward reaction is more than that of backward reaction. Reason (R ) : The threshold energy of the forward reaction is more than that of the backward reaction.
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 :C

Discussion

43.	Assertion (A): In 3d transition elements, the expected decrease in atomic radius is observed from Sc to V, thereafter upto Cu, the atomic radius nearly remains the same. Reason (R): As we move from Sc to V, the added 3d electrons only partially shield the increased nuclear charge but upto Cu, the extra electron added to 3d sub-shell repel the 4s electrons and the slight increase in nuclear charge operated in opposite direction and it leads to constancy in atomic radii.
Answer» Both (A) and (R) are CORRECT and (R) EXPLAINS (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) explains (A).

Discussion

44.	Assertion (A) : If the temperature of the electrolytic solution increases, conductance also increases. Reason (R) : Increase in temperature increases the kinetic energy of the ions and decreases the attractive force between the oppositely charged ions and hence conductivity increases.
Answer» Both A and R are CORRECT and R is the correct EXPLANATION of A Both A and R are WRONG A is correct but R is wrong A is wrong but R is correct ANSWER :A

Discussion

45.	Assertion (A): If the standard reduction potential of an electrode is greater than zero, then its reduced form is less stable compared to hydrogen gas. Reason (R) : Standard hydrogen electrode represented by Pt (s)\|H_(2) (g)\|H^+(aq) is assigned a zero potential at all temperatures.
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

46.	Assertion (A) : If the solution does not obey Raoult's law over the entire range of concentration,it is called non-ideal solution.Reason (R) : Azeotropes are binary mixtures which have the same composition in liquid and vapour phase.
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 :B

Discussion

47.	Assertion (A) : If the activation energy of a reaction is zero, temperature will have no effect on the rate constant Reason (R) :Lower the activation energy , faster is the reaction .
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 Answer :b

Discussion

48.	Assertion (A) : If manganese dioxide is added to potassium chlorate and the mixture is heated, we get O_2 gas at a much lower temperature. Reason (R) : If a catalyst is added to the reagent, the activation energy is lowered.
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

49.	Assertion (A) : If an iron rod is dipped in CuSO_4 solution, then blue colour of solution turns red. Reason (R) : Iron is more reactive than copper and so iron displaces copper from CuSO_4 solution.
Answer» Both A and R are CORRECT, but R is not the correct EXPLANATION of A. Both A and R are correct, but R is the correct explanation of A. A is WRONG but R is correct A is correct but R is wrong ANSWER :A

Discussion

50.	Assertion (A) : If an iron rod is dipped in CuSO_(4) solution, then blue colour of the solution truns red. Reason (R ): Iron is more reactive than copper and so iron displaces copper from CuSO_(4) solution.
Answer» Both A and R are correct and R is the correct explanation of A Both A and R are wrong 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

Explore topic-wise InterviewSolutions in Current Affairs.

Assertion (A) : Methyl cyanide has higher boiling point than methyl isocyanide. Reason (R ) : Dipole moment of methyl cyanide is higher than that of methyl iso cyanide.

Assertion (A) : Metallurgy of Ag from argentite is known as hydro-metallurgy. Reason (R ) : Argentite is Ag_(2)S.

Assertion (A) : Metallic zinc is used in galvanising metals such as iron and steel. Reason (R ) : Zinc is also used to produce die castings.

Assertion (A): MeMgBr should be preapared under perfectlyanhydrous conditions. Reason (R):Grinardreagent reacts with water.

Assertion (A): Melamine and acetaldehyde are the monomers for the preparation of melamine polymers. Reason (R) Butadiene-styrene copolymer is quite tough and is a good substitute for natural rubber.

Assertion (A) : Many gemstones are impure form of Al_(2)O_(3). Reason (S) : A downward stream of running water is used in hydraulic washing.

Assertion (A): Maltose is obtained by the hydrolysis of sucrose. Reason (R) : Citrus fruits and green leafy vegetables contain vitamin C.

Assertion (A) : Lyphobic colloids are solvent loving and are prepared by direct mixing of the dispersed phase in dispersion medium. Reason (R) : Substances that enhance the activity of catalyst are called promotars.

Assertion (A) : Lyophobic sols are more stable than lyophilic sols. Reason (R) : The process of settling colloidal particles is called coagulation.

Assertion (A): Lyophobic colloids like sols of gold will precipitate readily. Reason (R) : In lyophobic colloids, no attractive force exists between the dispersed phase and dispersion medium and are less stable.

Assertion (A): Lyophillic colloids will not get precipitated easily. Reason (R) : In lyophillic colloids, definite attractive forces exists between dispersion medium and dispersed phase and they are more stable.

Assertion (A): Low spin tetrahedral complexes are rarely observed. Reason(R ): Crystal field splitting energy is less than pairing energy for tetrahedral complexes.

Assertion (A) : Low spin tetrahedral complexes are rarely observed. Reason (R ) : The orbital splitting energies are not sufficiently large to forcing pairing

Assertion (A) : Linkage isomerism is studied under stereoisomerism. Reason (R) : The names of coordination compounds are derived by following the principles of additive nomenclature.

Assertion (A) : Linkage isomerism arises in a coordination compound containing ambidentate ligand. Reason (R) : Coordination isomerism arises from the interchange of ligands between cationic and anionic entities of different metal ions present in the complex.

Assertion (A) : Linkage isomerism arises in coordination compounds because of ambidentateligand. Reason (R ) : Ambidentate ligand like NO_(2) has two different donor atoms i.e., N and O.

Assertion (A): Like bromination of benzene bromination of phenol is also carried out in presence of Lewis acid. Reason (R) : Lewis acid polarises bromine molecule.

Assertion (A): Latex is a colloidal solution of rubber in water. Reason (R) : Natural rubber may be considered as a linear polymer of isoprene.

Assertion: A large dry cell has high e.m.f. Reason: The e.m.fof a dry cell is proportional to its size.

Assertion (A) : KCN reacts with methyl chloride to give methyl isocyanide.Reason (R ) : CN^(-) is an ambident nucleophile.

Assertion (A) : IUPAC name of ethanamine is ethylamine. Reason (R) : In IUPAC system, C_(6)H_(5)-NH_(2) is named as benzenamine.

Assertion (A) : It is difficult to replace chlorine by - OH in chlorobenzene in comparison to that in chloroethane.Reason (R ) : Chlorine - carbon (C - Cl) bond in chlorobenzene has a partial double bond character due to resonance.

Assertion (A): Iron colloid cannot be prepared by Bredig's are method. Reason (R): Iron cannot react with alkali hydroxide stabilising agent added in water.

Assertion (A) : Ions of the same charge in a given series show progressive decrease in radius with increasing atomic number. Reason (R) : The new electron enters a d-orbital each time the nuclear charge increases by unity.

Assertion (A) : Industrially, sulphur dioxide is produced as a byproduct of roasting of sulphide ores. Reason (R) : In the reaction of SO_2 with water and alkalies, the behaviour of SO_2 is very similar to that of CO_2.

Assertion (A) : Ionic solids do not conduct electricity in solid state but in molten state they conduct electricity. Reason (R) : In solid state, the ions are fixed in their lattice positions but in molten state, the ions are free to move and conduct electricity

Assertion (A): In transition metal series, the ionization enthalpy increases. Reason (R): This is due to increase in nuclear charge corresponding to the filling of d electrons.

Assertion (A) : In the complex ions [Fe(C_(2)O_(4))_(3)]^(3-), the coordination number of Fe is six. Reason (R) : Complexes in which a metal is bound to only one kind of groups are called hornoleptic.

Assertion (A) : In the complex ion [PtCl_(6)]^(2-), the coordination number of Pt is 6. Reason (R) : Both double salts as well as complexes are formed by the combination of two or more stable compounds in stoichiometric ratio.

Assertion (A) : In presence of enzymes, substrate molecule can be attacked by the reagent effectively. Reason (R) : Active sites of enzymes hold the substrate molecule in a suitable position.

Assertion (A) In presence of enzyme, substrate molecule can be attacked by the reagent effectively. Reason (R) Active sites of enzymes hold the substrate molecule in a suitable position.

Assertion (A) : In order to convert R-Cl to pure R-NH_(2) Gabriel Phthalimide synthesis can be used. Reason (R) : Phthalimide synthesis can be used to prepare pure 1^(@) or 2^(@) or 3^(@) amines separately with proper choice of alkyl halide.

Assertion (A) : In K_(4)[Fe(CN)_(6)], the coordination number is six. Reason (R ) : The number of sigma bonds between ligands and the central metal atom is known as coordination number.

Assertion (A) : In monohaloarenes, further electrophilic substitution occurs at ortho and para positions.Reason (R ). Halogen atom is a ring deactivator.

Assertion (A) : In Daniel cell, the salt bridge contains an agar-agar gel mixed with an inert electrolyte KCl (or) Na_2SO_4 Reason (R) : The ions of inert electrolyte do not react with other ions present in half cells and they are not either oxidised or reduced at electrodes.

Assertion (A) : In H_(2) Cl_(2) and I_(2), the atoms or molecules are held by weak dispersion forces. Reason (R) : Diamond and silicon carbide are examples of ionic solids.

Assertion (A): IN comparison to C_(2) H_(5)Br, it is difficultto carry out SN reaction o vinylbromide. Reason (R):Vinyl groupis electrondonating.

Assertion (A) : In bcc, the available volume is more efficiently used than in simple cubic packing. Reason (R) : In simple cubic arrangement, the number of spheres belongs to a unit cell is equal to one whereas in bcc, it is equal to 2.

Assertion (A) : In a reversible endothermic reaction, E_("act") of forward reaction is more than that of backward reaction. Reason (R ) : The threshold energy of the forward reaction is more than that of the backward reaction.

Assertion (A) : If the temperature of the electrolytic solution increases, conductance also increases. Reason (R) : Increase in temperature increases the kinetic energy of the ions and decreases the attractive force between the oppositely charged ions and hence conductivity increases.

Assertion (A): If the standard reduction potential of an electrode is greater than zero, then its reduced form is less stable compared to hydrogen gas. Reason (R) : Standard hydrogen electrode represented by Pt (s)|H_(2) (g)|H^+(aq) is assigned a zero potential at all temperatures.

Assertion (A) : If the solution does not obey Raoult's law over the entire range of concentration,it is called non-ideal solution.Reason (R) : Azeotropes are binary mixtures which have the same composition in liquid and vapour phase.

Assertion (A) : If the activation energy of a reaction is zero, temperature will have no effect on the rate constant Reason (R) :Lower the activation energy , faster is the reaction .

Assertion (A) : If manganese dioxide is added to potassium chlorate and the mixture is heated, we get O_2 gas at a much lower temperature. Reason (R) : If a catalyst is added to the reagent, the activation energy is lowered.

Assertion (A) : If an iron rod is dipped in CuSO_4 solution, then blue colour of solution turns red. Reason (R) : Iron is more reactive than copper and so iron displaces copper from CuSO_4 solution.

Assertion (A) : If an iron rod is dipped in CuSO_(4) solution, then blue colour of the solution truns red. Reason (R ): Iron is more reactive than copper and so iron displaces copper from CuSO_(4) solution.