NCERT Class 12 Chemistry Examinations Questions and Answers NCERT Class 12 Chemistry QUESTIONS

NCERT Class 12 Chemistry Examinations Questions and Answers

121 The monomer of polystyrene is

A C6H5CH=CH2

B CH2=CH—CHO

C C2H —CH=CH2

D CH2=CHCl

Answer: C6H5CH=CH2

122 Which is favourable for physical adsorption?

A Low T and high P

B T and P do not affect

C High T and high P

D High T and low P

Answer: Low T and high P

123 If cone, of reactant ‘A’ is increased 10 times and rate of reaction becomes 100 times. What is order with respect to ‘A’?

A -1

B 1

C 4

D 3

Answer: 1

124 A conductivity cell containing electrodes made up of

A Gold

B Silver

C Platinised platinum

D Copper

Answer: Platinised platinum

125 Ag+(aq) + e– → Ag(s) E° = + 0.80 V Fe2+(aq)+ + 2e– → Fe(s) E° = – 0.44 V What is emf of Fe(s) + 2Ag+(aq) → Fe2+(aq) + 2Ag(s)

A 1.16 V

B 1.24 V

C 2.04 V

D -1.16 V

Answer: 1.24 V

126 A new galvanic cell of E^u more than E°dl of Daniel cell is connected to Daniel cell in a manner that new cell gives electrons to cathode, what will happen

A Ecell will increase

B Ecell will decrease

C No change will take place

D Daniel cell will work as electrolytic cell where Zn will be deposite on zinc rod and copper will dissolve from copper rod.

Answer: Ecell will decrease

127 The number of moles of NaCl in 3 litres of 3M solution is

A 9

B 27

C 1

D 3

Answer: 9

128 The molality of pure water is

A 60.5

B 55.5

C 50.5

D 18

Answer: 55.5

129 If E°Fe2+/Fe = -0.441 V and E°Fe2+/Fe2+ = 0.771 V, the standard EMF of the reaction, Fe + 2Fe3+ → 3Fe2+ will be

A 1.212 V

B 1.653 V

C 0.111 V

D 0.330 V

Answer: 1.212 V

130 The reaction, 3ClO– (aq) → ClO3 (aq) + 2Cl– (aq) is an example of

A Oxidation reaction

B Reduction reaction

C Disproportionation reaction

D Decomposition reaction

Answer: Disproportionation reaction

NCERT Class 12 Chemistry Examinations Questions and Answers

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