NCERT Class 12 Chemistry General Awareness Questions and Answers

NCERT Class 12 Chemistry General Awareness Questions and Answers NCERT Class 12 Chemistry QUESTIONS

NCERT Class 12 Chemistry General Awareness Questions and Answers

91 NH4NC>3 is used in salt bridge because
A it forms a jelly like material with agar-agar.
B it is a weak electrolyte.
C it is a good conductor of electricity.
D the transport number of NH4+ and NO3– ions are almost equal.

Answer: the transport number of NH4+ and NO3– ions are almost equal.
92 limiting molar conductivity of Ca2+ and Cl– are 119.0 and 76.3 S cm2 mol-1, then the value of limiting molar conductivity of CaCl2 will be
A 195.3 S cm2 mol-1
B 271.6 S cm2 mol-1
C 43.3 S cm2 mol-1
D 314.3 S cm2 mol-1.

Answer: 271.6 S cm2 mol-1
93 The charge required for the reduction of 1 mol of MnO2– to MnO2 is
A 1 F
B 3 F
C 6 F
D 5 F

Answer: 3 F
94 charcoal at same temperature and pressure is
A CH4 < H2 < SO2
B H2 < CH4 < SO2
C H2 < SO2 < CH4
D SO2 < CH4 < H2

Answer: H2 < CH4 < SO2
95 The formation of micelles takes place only above
A Kraft temperature
B Critical temperature
C Boyle’s temperature
D Inversion temperature

Answer: Kraft temperature
96 Colloidion is 4% solution of which one of the following in alcohol-ether mixture.
A Nitrocellulose
B Glycol dinitrate
C Cellulose acetate
D Nitroglycerin

Answer: Nitrocellulose
97 The protective power of lyophilic colloidal sol is expressed in terms of
A gold number
B oxidation numbers
C CMC (Critical Micelle Concentration)
D coagulation value

Answer: gold number
98 Λ of M/32 solution of weak acid is 8 S cm2 mol-1 and limiting molar conductivity is 400 S cm2 mol1. Ka for acid is
A 1.25 × 10-6
B 6.25× 10-4
C 1.25 × 10-4
D 1.25 × 10-5

Answer: 1.25 × 10-5
99 While charging the lead storage battery _________ .
A PbSO4 anode is reduced to Pb.
B PbSO4 cathode is reduced to Pb.
C PbSO4 cathode is oxidised to Pb.
D PbSO4 anode is oxidised to PbO2.

Answer: PbSO4 anode is reduced to Pb.
100 Detergents are better than soaps because
A They can be used in acidic solution
B They are less affected by hard water
C Both (a) and (b)
D They wash clothes better

Answer: Both (a) and (b)

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