94420 + Interview Questions in Chemistry in Class 12

1.	Assertion (A) : Osmotic pressure is a colligative property. Reason ( R ) : Osmotic pressure is directly proportional to molarity.
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

2.	Assertion (A) : Ordinary sulphur exists as a planar eight membered ring, S_8. Reason (R) :ppi-ppi bonding is not possible in sulphur.
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 :Assertion. SULPHUR exists as puckered NON PLANAR eight MEMBERED ring, `S_8`.

Discussion

3.	Assertion (A) : Ores containing magnetic impurities can be purified by magnetic separation process. Reason (S) : Removal of unwanted meterials from the ore is called concentration.
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 :B

Discussion

4.	Assertion (A) : Order of the reaction can be zero or fractional Reason (R) : We cannot determine order from balanced chemical equation
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

5.	Assertion (A) : Optical isomers are mirror images that cannot be superimposed on one another. Reason (R) : Outer orbital complexes are also called high spin complexes.
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 :A

Discussion

6.	Assertion (A) : One atomic mass unit is defined as one twelfth of the mass of one carbon - 12 atom. Reason (R) : Carbon - 12 isotope is the most abundunt isotope of carbon and has been chosen as standard.
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 the correct explanation of A. A is true but R is false. Both A and R are false. Solution :Correct explanation. Choosing C-12 as the standard, the RELATIVE masses of atoms COME out to be CLOSE to whole NUMBER values and ambiguity of oxygen as reference was solved.

Discussion

7.	Assertion (A): On prolonged healing with HI, glucose forms H-hexane. Reason (R) Acetylation of glucose with acetic anhydride gives glucose pentaacetate which confirms the presence of five - OH groups.
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

8.	Assertion (A) : On oxidation, primary alcohols yield aldehydes with mild oxidising agent. Reason (R): The C-O bond in ethers cannot be cleaved by hydrogen halide.
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 explanationof 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

9.	Assertion (A) : Olefinic monomers undergo addition polymerization. Reason (R) : Polymerization of vinylchloride is initiated by peroxides/persulphates.
Answer» Assertion and reason both are CORRECT STATEMENTS but reason does not explain assertion. Assertion and reason both are correct statements and reason explain the assertion. Both assertion and reason are wrong statements. Assertion is correct statement and reason is wrong statement. Solution :Assertion and reason both are correct statements but reason does not explain assertion. Olefin monomers undergo addition polymerization because it add on to other monomers of olefin through free radical MECHANISM due to the presence of peroxide initiator and DOUBLE bond and produces HIGH molecular mass polymers.

Discussion

10.	Assertion (A): o-nitrophenol is less soluble in water than m-nitrophenol. Reason (R): m-nitrophenol and p-nitrophenols exist as associated molecules.
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 and reason both are correct statements but reason does not explains the assertion. Solution :o-nitrophenol has a LESS SOLUBILITY due to intramolecular H-bonding. The m-nitrophenol and p-nitrophenol exist as associated MOLECULES due to INTERMOLECULAR H-bonding.

Discussion

11.	Assertion (A): o-phenol sulphonic acid on heating at 100^(@)C changes to p-phenol sulphonic acid. Reason : Sulphonation of phenol is a reversibleprocess.
Answer» Both A and R are CORRECT and R is 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 in correct A is INCORRECT but R is correct Answer :B

Discussion

12.	Assertion (A) : o-nitrophenol is a weaker acid than p-nitrophenol. Reason (R ) : Intramolecular hydrogen bonding makes ortho isomer weaker than para isomer.
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

13.	Assertion (A): Nylon 6 is used for the manufacture of tyre, cords, fabrics and ropes. ? Reason (R) : Polyesters are made by the condensation of glycerol and terephthalic acid.
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 :C

Discussion

14.	Assertion (A): Number of particles in colloidal dispersions are less in compare to homogeneous solutions. Reason (R) : Colloidal particles are huge aggregates.
Answer» ASSERTION (A) and Reason (R) both are TRUE. (R) is the PROPER explanation of (A). Assertion (A) and Reason (R) both are true but (R) does not EXPLAINS (A). Assertion (A) and Reason (R) both are false. Assertion (A) is not true but Reason (R) is true. Solution :Assertion (A) and Reason (R) both are true. (R) is the proper explanation of (A).

Discussion

15.	Assertion (A) :Nuclear isomers have same atomic number and same mass number but with different radioactive properties. Reason (R) : U_((A)) and U_((Z)) are nuclear isomers.
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 not the correct explanation of `(A)` If `(A)` is correct, but `(R)` is incorrect. Answer :A

Discussion

16.	Assertion : A nuclear binding energy per nucleon is in the order ._(4)^(9)Be gt ._(3)^(7)Li gt ._(2)^(4)He Reason : Binding energy per nucleon increases linearly with difference in number of neutrons and protons.
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 explanantion of the assertion If assertion is true but reason is false If the assertion and reason both are false Solution :Binding energy per nucleon of `._(3)Li^(7)` (5.38 MeV) is lesser than `._(2)He^(4)` (7.08 MeV) as helium is found to be more stable than Li. As the atomic mass number increases, the binding energy per nucleon decreases. As the atomic number and the atomic mass number increase, the repulsive electrostatic forces with in the nucleus increase DUE to the greater number of protons in the heavy elements. To over come this increased repulsion, the proportion of neutrons in the nucleus must increase to maintain STABILITY. This increase in the neutron to proton ratio only partially compensates for the GROWING proton-proton repulsive FORCE in the heavier, naturally occurring elements.

Discussion

17.	Assertion (A) : Non-competitive inhibitor inhibits the catalytic activity of enzyme by binding with its active site. Reason (R) : Non-competitive inhibitor changes the shape of the active site in such a way that substrate can't recognise it.
Answer» Assertion and REASON both are CORRECT statement but reason does not EXPLAIN assertion. Assertion and reason both are correct and reason EXPLAINS the assertion. Both assertion and reason are WRONG statement. Assertion is wrong statement reason is correct statement. Solution :Assertion is wrong statement reason is correct statement.

Discussion

18.	Assertion (A): Noble gases show no tendency for chemical reaction. Reason (R) : Noble gas have complete octet in their outermost shell.
Answer» Both ASSERTION (A) and Reason (R) are correct statements, and RENSON (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

19.	Assertion (A) : Noble gases have the largest ionisation energy compared to any other elements. Reason (R ) : Noble gases have incomplete filled orbital.
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 is correct but R is wrong

Discussion

20.	Assertion (A): Noble gases are least reactivity. Reason (R):Noble gases have completely filled s and p-orbital and attain stableelectronic configuration.
Answer» A and R are CORRECT and R EXPLAINS A. A and R are correct and R not explains A. A is correct R is WRONG. A is wrong but R is correct Answer :A

Discussion

21.	Assertion (A) : Noble gases have very low boiling points. Reason (R) : Noble gases being monoatomic have no intermolecular forces except weakdispersion forces.
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 :A

Discussion

22.	Assertion (A) : Nitrogen orbitals in amines are sp^(3) hybridised and the geometry of amines is pyramidal. Reason (R) : Amines may be regarded as derivations of ammonia.
Answer» (a) Both ASSERTION (A) and Reason (R) are CORRECT statements, and Reason (R) is the correct EXPLANATION of the Asssertion (A). Both Assertion (A) and Reason (R) are correct statements, but Reason (R) isnot 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

23.	Assertion (A) : Nitrogen gas is chemically inert. Reason (R ) : Nitrogen has low bonding energy.
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 is correct but R is wrong

Discussion

24.	Assertion (A) : Nitrobenzene does not undergo Friedel-crafts reaction. Reason (R) : Nitrogroup in nitrobenzene deactivates the benzene ring.
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 :A

Discussion

25.	Assertion (A) : Nitrogen has a tendency to formp pi - p pibond with itself giving rise to the formation of N_2. Reason (R) : Bond enthalpy of N_2 is extremely high.
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 :A

Discussion

26.	Assertion (A) : Nitro compounds are reduced to amines by passing hydrogen gas in the presence of finely divided nickel. Reason (R) : Nitriles cannot be reduced to primary amines using lithium aluminium hydride.
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

27.	Assertion (A) : Nitration of aniline can only be done by protecting -NH_(2) group through acetylation. Reason (R) : Acetylation of aniline results in the increase of electron density at the benzene ring.
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

28.	Assertion (A) : Nitration of chlorobenzene leads to the formation of m-nitrochlorobenzene.Reason (R ) : - NO_(2) group is a m-directing group.
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 :`-X(X=F, CL, Br, I)` is o - and p - directing groups.

Discussion

29.	Assertion (A) : [Ni(CO)_(4)] is diamagnetic Reason (R ) : In [Ni(CO)_(4)], there is no unpaired electrons and so it is dimagnetic.
Answer» Both A and R are WRONG A is wrong but R is CORRECT 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. Answer :C

Discussion

30.	Assertion (A): Ni (II) compounds are thermodynamically more stable than Pt (II) compounds. Reason (R): The energy required to form Ni^(2+) is less than that of Pt^(2+).
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

31.	Assertion (A) Network polymers are thermosetting Reason (R ) Network Polymers have high molecular mass
Answer» If both assertion and REASON are trueand reason is the correct EXPLANATIONOF assertion . If both assertion and reason are true but reason is not the correct explanationof assertion . If assertion is true but reason is false. If both assertion and reason are false. ANSWER :B

Discussion

32.	Assertion (A) : Network polymers are thermosetting. Reason (R) : Network polymers have high - molecular mass.
Answer» Assertion and reason both are correct statements but reason does not EXPLAIN assertion. Assertion and reason both are correct statements and reason explain the assertion. Both assertion and reason are wrong statements. Assertion is correct STATEMENT and reason is wrong statement. Solution :Assertion and reason both are correct statements but reason does not explain assertion. Network polymers are thermosetting because they can.t be REUSED after heating once. Because after heating it undergo EXTENSIVE cross linking in moulds and again become infusible.

Discussion

33.	Assertion (A) : n-propylamine boils at a higher temperature than n-propanol. Reason (R) : n- propanal molecules form hydrogen bonds.
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 :D

Discussion

34.	Assertion: A negative value of standard reduction potential means that reduction takes place on this electrode with reference to standard hydrogen electrode. Reason: The standard electrode potential of a half cell has a fixed value.
Answer» if both assertion and reason are true and the reason is the correct explanation of the assertion. If both assertion and reason are true but reason is not the correct explanation of the assertion. If assertion is true but reason is FALSE If assertion is false but reason is true. Solution :A negative value of standard reduction potential means that oxidation takes PLACE ONT his electrode with reference to SHE.

Discussion

35.	Assertion (A) : NaCl is used for removing snow from roads.Reason (R ) : NaCl decreases the freezing point of water.
Answer» Assertion and reason both are correct STATEMENTS and reason is correct EXPLANATION for assertion. Assertion and reason both are correct statements but reason is not correct explanation for assertion. Assertion is correct STATEMENT but reason is wrong statement. Assertion and reason both are INCORRECT statements. Answer :A

Discussion

36.	Assertion (A) : Most of the transition complexes are coloured. Reason (R ): Transition complexes absorbs the light of particular wavelength in the visible light. The transmitted light gives the complementary colour.
Answer» Both A and R are CORRECT and R is the correct EXPLANATION of A. A is correct but R is WRONG A and R are wrong A is wrong but R is correct Answer :A

Discussion

37.	Assertion (A) : Most of the methanol is prepared by catalytic hydrogenation of carbon monoxide in the presence of Al_(2)O_(3). Reason (R) : The enzyme used in the hydrolysis of cane sugar to glucose and fructose is invertase.
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 EXPLANATIONOF 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

38.	Assertion (A) : Most of the Synthetic polymers are not biodegradable. Reason (R) : Polymerization process induces toxic character in organic molecules.
Answer» ASSERTION and reason both are CORRECT STATEMENTS but reason does not explain assertion. Assertion and reason both are correct statements and reason explain the assertion. Both assertion and reason are wrong statements. Assertion is correct statement and reason is wrong statement. Solution :Assertion is correct statement and reason is wrong statement. Most of the SYNTHETIC polymers are not biodegradable because they are hazardous to the ENVIRONMENT and are not easily broken by soil organisms.

Discussion

39.	Assertion (A) : Monoclinic sulphur is less stable than rhomobic sulphur. Reason (R ) : Monoclinic sulphur is stable between 96^(@)C-119^(@)C and slowly changes into rhombic sulphur.
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

40.	Assertion (A) : Mole fraction of a gas in the solution is proportional to the partial pressure of the gas over the solution.Reason (R) : Pressure does not have any significant effect on the solubility of solids inliquids
Answer» Both ASSERTION (A) and REASON (R) are correct STATEMENTS, and Reason (R) is the correct explanationof the Assertion (A). Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanationof 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

41.	Assertion (A): Moist Cl_(2) bleaches the vegetable colouring matter Reason R: Cl_(2) is a strong reducing agent
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 :Chlorine is strong oxidizing agent

Discussion

42.	Assertion (A) : Molar conductance of a solution increases with increase in dilution. Reason (R) : For a strong electrolyte, inter ionic force of attraction decreases with dilution and so conductivity increases. For a weak electrolyte, degree of dissociation increases with dilution and coductivity 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

43.	Assertion (A) : Mohr's Salt answers the presence of Fe^(2+) , NH_(4)^(+) and SO_(4)^(2-) ions. Reason (R ) : The double salt, Mohr's salt loose their identity and dissociates into their constituent simple ions in solution.
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. Both A and R are WRONG A is wrong but R is correct Answer :A

Discussion

44.	Assertion (A): Mn^(2+) is more stable than Mn^(4+). Reason (R): Mn^(2+) (3d^(5)) is more stable than Mn^(4+) (3d^(3)) is due to extra stability of half-filled electronic configuration.
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

45.	Assertion: A mixture of cyclohexane and ethanol shows -ve deviation from Raoult's law. Reason:Cyclohexane reduces the intermolecular attraction between ethanol molecules.
Answer» If both assertion and reason are true and the reason is the correct EXPLANATION of the assertion If both the assertion and reason are true but reason is not the correct explanation of the assertion If assertion is true but reason is false If assertion is false but reason is true. Solution :The given explaination is correct and a reduction in molecular attraction will increase vaporisation nature and LEAD for higher vapour prssure than that calculated by Raoult's law .Thus ,mixture will SHOWS positive deviation.

Discussion

46.	Assertion : A mixture of cyclohexane and ethanol shows -ve deviation from Raoult's law . Reason : Cyclohexane reduces the intermolcular attraction between ethanol molecules.
Answer» If both the assertion and REASON are TRUE and reason is a true explanation of the assertion. If both the assertion and reason are true but reason is not the correct explanation of the assertion If assertion is true but reason is false If assertion is false but reason is true. Solution :The given explaination is correct and a reduction in molecular attraction will increase vaporisation NATURE and lead for HIGHER vapour prssure than that calculated by Raoult's law .Thus ,mixture will SHOWS positive deviation.

Discussion

47.	Assertion: A mixture of 2-nitrophenol and 4-nitrophenol can be separated by steam distillation. Reason: 2-Nitrophenol is intramolecularly hydrogen bonded while 4-nitrophenol is intermolecularly hydrogen bonded.
Answer» If both ASSERTION and REASON are TRUE, and reason is the true EXPLANATION of the assertion. If both assertion and reason are true, but reason is not the true explanation o the assertion. if assertion is true, but reason is false. If both assertion and reason are false. Answer :A

Discussion

48.	Assertion. A micelle formed by sodium stearate in water has -COO^- groups at the surface. Reason. Surface tension of water is reduced by the addition of stearate.
Answer» ANSWER :A

Discussion

49.	Assertion (A) : Methyl isocyanide cannot be hydrolysed by dilute alkali. Reason (R) : N-atom in methyl isocyanide has a negative charge and hence nucleiphile cannot attack it.
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 :A

Discussion

50.	Assertion (A) : Methy isocyanide has higher boiling point than methy, cyanide. Reason (R) : Methyl isocyanide has a coordinate bond between N and C. N is domor while carbon atom is acceptor.
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 :D

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Assertion (A) : Osmotic pressure is a colligative property. Reason ( R ) : Osmotic pressure is directly proportional to molarity.

Assertion (A) : Ordinary sulphur exists as a planar eight membered ring, S_8. Reason (R) :ppi-ppi bonding is not possible in sulphur.

Assertion (A) : Ores containing magnetic impurities can be purified by magnetic separation process. Reason (S) : Removal of unwanted meterials from the ore is called concentration.

Assertion (A) : Order of the reaction can be zero or fractional Reason (R) : We cannot determine order from balanced chemical equation

Assertion (A) : Optical isomers are mirror images that cannot be superimposed on one another. Reason (R) : Outer orbital complexes are also called high spin complexes.

Assertion (A) : One atomic mass unit is defined as one twelfth of the mass of one carbon - 12 atom. Reason (R) : Carbon - 12 isotope is the most abundunt isotope of carbon and has been chosen as standard.

Assertion (A): On prolonged healing with HI, glucose forms H-hexane. Reason (R) Acetylation of glucose with acetic anhydride gives glucose pentaacetate which confirms the presence of five - OH groups.

Assertion (A) : On oxidation, primary alcohols yield aldehydes with mild oxidising agent. Reason (R): The C-O bond in ethers cannot be cleaved by hydrogen halide.

Assertion (A) : Olefinic monomers undergo addition polymerization. Reason (R) : Polymerization of vinylchloride is initiated by peroxides/persulphates.

Assertion (A): o-nitrophenol is less soluble in water than m-nitrophenol. Reason (R): m-nitrophenol and p-nitrophenols exist as associated molecules.

Assertion (A): o-phenol sulphonic acid on heating at 100^(@)C changes to p-phenol sulphonic acid. Reason : Sulphonation of phenol is a reversibleprocess.

Assertion (A) : o-nitrophenol is a weaker acid than p-nitrophenol. Reason (R ) : Intramolecular hydrogen bonding makes ortho isomer weaker than para isomer.

Assertion (A): Nylon 6 is used for the manufacture of tyre, cords, fabrics and ropes. ? Reason (R) : Polyesters are made by the condensation of glycerol and terephthalic acid.

Assertion (A): Number of particles in colloidal dispersions are less in compare to homogeneous solutions. Reason (R) : Colloidal particles are huge aggregates.

Assertion (A) :Nuclear isomers have same atomic number and same mass number but with different radioactive properties. Reason (R) : U_((A)) and U_((Z)) are nuclear isomers.

Assertion : A nuclear binding energy per nucleon is in the order ._(4)^(9)Be gt ._(3)^(7)Li gt ._(2)^(4)He Reason : Binding energy per nucleon increases linearly with difference in number of neutrons and protons.

Assertion (A) : Non-competitive inhibitor inhibits the catalytic activity of enzyme by binding with its active site. Reason (R) : Non-competitive inhibitor changes the shape of the active site in such a way that substrate can't recognise it.

Assertion (A): Noble gases show no tendency for chemical reaction. Reason (R) : Noble gas have complete octet in their outermost shell.

Assertion (A) : Noble gases have the largest ionisation energy compared to any other elements. Reason (R ) : Noble gases have incomplete filled orbital.

Assertion (A): Noble gases are least reactivity. Reason (R):Noble gases have completely filled s and p-orbital and attain stableelectronic configuration.

Assertion (A) : Noble gases have very low boiling points. Reason (R) : Noble gases being monoatomic have no intermolecular forces except weakdispersion forces.

Assertion (A) : Nitrogen orbitals in amines are sp^(3) hybridised and the geometry of amines is pyramidal. Reason (R) : Amines may be regarded as derivations of ammonia.

Assertion (A) : Nitrogen gas is chemically inert. Reason (R ) : Nitrogen has low bonding energy.

Assertion (A) : Nitrobenzene does not undergo Friedel-crafts reaction. Reason (R) : Nitrogroup in nitrobenzene deactivates the benzene ring.

Assertion (A) : Nitrogen has a tendency to formp pi - p pibond with itself giving rise to the formation of N_2. Reason (R) : Bond enthalpy of N_2 is extremely high.

Assertion (A) : Nitro compounds are reduced to amines by passing hydrogen gas in the presence of finely divided nickel. Reason (R) : Nitriles cannot be reduced to primary amines using lithium aluminium hydride.

Assertion (A) : Nitration of aniline can only be done by protecting -NH_(2) group through acetylation. Reason (R) : Acetylation of aniline results in the increase of electron density at the benzene ring.

Assertion (A) : Nitration of chlorobenzene leads to the formation of m-nitrochlorobenzene.Reason (R ) : - NO_(2) group is a m-directing group.

Assertion (A) : [Ni(CO)_(4)] is diamagnetic Reason (R ) : In [Ni(CO)_(4)], there is no unpaired electrons and so it is dimagnetic.

Assertion (A): Ni (II) compounds are thermodynamically more stable than Pt (II) compounds. Reason (R): The energy required to form Ni^(2+) is less than that of Pt^(2+).

Assertion (A) Network polymers are thermosetting Reason (R ) Network Polymers have high molecular mass

Assertion (A) : Network polymers are thermosetting. Reason (R) : Network polymers have high - molecular mass.

Assertion (A) : n-propylamine boils at a higher temperature than n-propanol. Reason (R) : n- propanal molecules form hydrogen bonds.

Assertion: A negative value of standard reduction potential means that reduction takes place on this electrode with reference to standard hydrogen electrode. Reason: The standard electrode potential of a half cell has a fixed value.

Assertion (A) : NaCl is used for removing snow from roads.Reason (R ) : NaCl decreases the freezing point of water.

Assertion (A) : Most of the transition complexes are coloured. Reason (R ): Transition complexes absorbs the light of particular wavelength in the visible light. The transmitted light gives the complementary colour.

Assertion (A) : Most of the methanol is prepared by catalytic hydrogenation of carbon monoxide in the presence of Al_(2)O_(3). Reason (R) : The enzyme used in the hydrolysis of cane sugar to glucose and fructose is invertase.

Assertion (A) : Most of the Synthetic polymers are not biodegradable. Reason (R) : Polymerization process induces toxic character in organic molecules.

Assertion (A) : Monoclinic sulphur is less stable than rhomobic sulphur. Reason (R ) : Monoclinic sulphur is stable between 96^(@)C-119^(@)C and slowly changes into rhombic sulphur.

Assertion (A) : Mole fraction of a gas in the solution is proportional to the partial pressure of the gas over the solution.Reason (R) : Pressure does not have any significant effect on the solubility of solids inliquids

Assertion (A): Moist Cl_(2) bleaches the vegetable colouring matter Reason R: Cl_(2) is a strong reducing agent

Assertion (A) : Mohr's Salt answers the presence of Fe^(2+) , NH_(4)^(+) and SO_(4)^(2-) ions. Reason (R ) : The double salt, Mohr's salt loose their identity and dissociates into their constituent simple ions in solution.

Assertion (A): Mn^(2+) is more stable than Mn^(4+). Reason (R): Mn^(2+) (3d^(5)) is more stable than Mn^(4+) (3d^(3)) is due to extra stability of half-filled electronic configuration.

Assertion: A mixture of cyclohexane and ethanol shows -ve deviation from Raoult's law. Reason:Cyclohexane reduces the intermolecular attraction between ethanol molecules.

Assertion : A mixture of cyclohexane and ethanol shows -ve deviation from Raoult's law . Reason : Cyclohexane reduces the intermolcular attraction between ethanol molecules.

Assertion: A mixture of 2-nitrophenol and 4-nitrophenol can be separated by steam distillation. Reason: 2-Nitrophenol is intramolecularly hydrogen bonded while 4-nitrophenol is intermolecularly hydrogen bonded.

Assertion. A micelle formed by sodium stearate in water has -COO^- groups at the surface. Reason. Surface tension of water is reduced by the addition of stearate.

Assertion (A) : Methyl isocyanide cannot be hydrolysed by dilute alkali. Reason (R) : N-atom in methyl isocyanide has a negative charge and hence nucleiphile cannot attack it.

Assertion (A) : Methy isocyanide has higher boiling point than methy, cyanide. Reason (R) : Methyl isocyanide has a coordinate bond between N and C. N is domor while carbon atom is acceptor.