Electrochemistry MCQ | Questions – Paper 8

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Topic: Electrochemistry, Test No.: 08, Total MCQs: 10

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Question 1
What flows in the internal circuit of a galvanic cell?
A
Electricity
B
Electrons
C
Ions
D
Atoms
Question 2

What is the electrochemical equivalent (in g coulomb–1) of silver?

(Ag = 108; F = Faraday)

A
108F
B
108/F
C
F/108
D
1/108F
Question 3
What is the quantity of electricity (in coulombs) required to deposit all the silver from 250ml of 1 M AgNO3 solution? (Ag = 108)
A
2412.5
B
24125
C
4825.0
D
48250
Question 4

What is the reduction electrode potential (in volts) of copper electrode when [Cu2+] = 0.01M in a solution at 25°C?

(Eo of Cu2+/Cu electrode is +0.34V)

A
0.3991
B
0.2809
C
0.3105
D
0.3695
Question 5
What is the time (in sec) required for deposition all the silver present in 125mL of 1 M AgNO3 solution by passing a current of 241.25 amperes? (1F = 96500 coulombs)
A
10
B
50
C
1000
D
100
Question 6
When 3.86 amperes current is passed through an electrolyte for 50 minutes, 2.4 grams of a divalent metal is deposited. The gram atomic weight of the metal (in grams) is
A
24
B
12
C
64
D
40
Question 7
When a lead storage battery is discharged
A
lead is formed
B
SO2 is evolved
C
lead sulphate is consumed
D
sulphuric acid is consumed
Question 8
When electric current is passed through acidified water for 1930 seconds, 1120 mL of H2 gas is collected (at STP) at the cathode. What is the current passed in amperes?
A
0.05
B
0.50
C
5.0
D
50
Question 9
When same quantity of electricity is passed for half an hour, the amount of Cu and Cr deposited are respectively 0.375 g and 0.30 g. Ratio of electrochemical equivalent of Cu and Cr is
A
0.8
B
1.25
C
2.5
D
1.62
Question 10

The standard reduction potentials of Zn2+ | Zn, Cu2+ | Cu and Ag+ | Ag are respectively –0.76, 0.34 and 0.8 V. The following cells were constructed.

a) Zn | Zn2+ || Cu2+ | Cu

b) Zn | Zn2+ || Ag+ | Ag

c) Cu | Cu2+ || Ag+ | Ag

What is the correct order E°cell of these cells?

A
b > c > a
B
b > a > c
C
a > b > c
D
c > a > b
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