Class 12 Chemistry Chapter 3 Electrochemistry MCQs | Class 12 Chemistry Chapter 3 Electrochemistry Multiple Choice Questions (MCQs) and Answers

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Questions
1 Once a current of 1.0 ampere was passed through one litre of CuCl2 solution for 16 min and 5 sec, all of the solution’s copper was deposited at the cathode. The strength of solution CuCl2 was (Molar mass of Cu = 63.5; Faraday constant = 96,500 C/mol)
A 0.01N
B 0.01M
C 0.02M
D 0.2N

Answer:0.01N
2 On electrolysis of dilute sulphuric acid using platinum electrodes, the product obtained at the anode will be
A hydrogen
B oxygen
C hydrogen sulphide
D sulphur dioxide

Answer:oxygen
3 A device that converts the energy of combustion of fields like hydrogen and methane directly into electrical energy is known as
A Electrolytic cell
B Dynamo
C Ni-Cd cell
D Fuel cell

Answer: Fuel cell
4 Which reaction is not feasible?
A 2KO + Br2 → 2KBr + I2
B 2KBr + I2 → 2KI + Br2
C 2KBr + Cl2 → 2KCl + Br2
D 2H2O + 2F2 → 4HF + O2

Answer: 2KBr + I2 → 2KI + Br2
5 Without losing its concentration ZnCl2 solution cannot be kept in contact with
A Au
B Al
C Pb
D Ag

Answer: Al
6 The aqueous solution of which of the following compounds is the best conductor of electric current?
A Acetic acid
B Hydrochloric acid
C Ammonia
D Fructose

Answer:Hydrochloric acid
7 An increase in the conductivity equivalent of a solid electrolyte with dilution is primarily due to
A Increased ionic mobility of ions
B 100 percent electrolyte ionisation with natural dilution
C Increase in both ion numbers and ionic mobility
D A rise in ion counts

Answer:Increased ionic mobility of ions
8 The equivalent conductance of Ba2+ and Cl– are respectively 127 and 76 ohm-1 cm-1 eq-1 at infinite dilution. The equivalent conductance of BaCl2 at infinite dilution will be
A 139.5
B 203
C 279
D 101.5

Answer:139.5
9 When heating one end of a metal plate, the other end gets hot because of
A the resistance of the metal
B mobility of atoms in the metal
C energised electrons moving to the other end
D minor perturbation in the energy of atoms

Answer:energised electrons moving to the other end
10 The weight of silver displaced by a quantity of electricity which displaces 5600ml of O2 at STP will be
A 5.4g
B 10.8g
C 54.9g
D 108.0g

Answer:108.0g
11 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:Daniel cell will work as electrolytic cell where Zn will be deposite on zinc rod and copper will dissolve from copper rod.
12 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
13 A conductivity cell containing electrodes made up of
A Gold
B Silver
C Platinised platinum
D Copper

Answer: Platinised platinum
14 The standard emf of a galvanic cell involving cell reaction with n = 2 is formed to be 0.295 V at 25° C. The equilibrium constant of the reaction would be
A 1.0 × 1010
B 2.0 × 1011
C 4.0 × 1012
D 1.0 × 102

Answer: 1.0 × 1010
15 Which of the following statement is correct?
A ECell and ∆rG of cell reaction both are extensive properties.
B ECell and ∆rG of cell reaction both are . intensive properties.
C ECell is an intensive property while ∆rG of cell reaction is an extensive property.
D ECell is an extensive property while ∆rG of cell reaction is an intensive property.

Answer:ECell is an intensive property while ∆rG of cell reaction is an extensive property.
16 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
17 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
18 The positive value of the standard electrode potential of Cu2+/Cu indicates that _________
A this redox couple is a stronger reducing agent than the H+/H2 couple
B this redox couple is a stronger oxidising agent than H+/H2
C Cu can displace H2 from acid
D Cu cannot displace H2 from acid

Answer:this redox couple is a stronger oxidising agent than H+/H2
19 The charge required for the reduction of 1 mol of MnO2– to MnO2 is
A 1 F
B 3 F
C 5 F
D 6 F

Answer: 3 F
20 If 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

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