Electrochemistry MCQ | Questions – Paper 5


Topic: Electrochemistry, Test No.: 05, Total MCQs: 10

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Question 1
Among the following cells

Leclanche cell (I), Nickel-cadmium cell (II), Lead storage battery (III), Mercury cell (IV)

Primary cells are
A
I and II
B
I and III
C
II and III
D
I and IV
Question 2
An infinite dilution of aqueous solution of BaCl2, molar conductivity of Ba2+ and Cl- ions are = 127.32 S cm2/mol and 76.34 S cm2/mol respectively. What is  for BaCl2 at same dilute?
A
280 S cm2 mol-1
B
330.98 S cm2 mol-1
C
90.98 S cm2 mol-1
D
203.6 S cm2 mol-1
Question 3
Aqueous copper sulphate solution is electrolyzed using platinum electrodes. The electrode reaction occurring at cathode is
A
Cu2+ (aq) + 2e Cu(s)
B
Cu(s) Cu2+ (aq) + 2e
C
2H2O(l) O2(g) + 4H+ (aq) + 4e
D
O2(g) + 4H+ (aq) + 4e 2H2O(l)
Question 4

Calculate the reduction potential of a half-cell containing platinum electrode immersed in 2.0 M Fe2+ and 0.02 M Fe3+.

Given  = 0.771 V.

Fe3+ + e- Fe2+

A
0.653 V
B
0.889 V
C
0.683 V
D
2.771 V
Question 5
Conductivity of 0.01 M NaCl solution is 0.00147 ohm1 cm1. What happens to this conductivity if extra 100 ml of H2O will be added to the above solution?
A
Increases
B
Decreases
C
Remains unchanged
D
First increases and then decreases
Question 6
Consider the following four electrodes,

P = Cu2+ (0.0001 M) | Cu(s)

Q = Cu2+ (0.1 M) | Cu(s)

R = Cu2+ (0.01 M) | Cu(s)

S = Cu2+ (0.001 M) | Cu(s)

If the standard reduction potential of Cu2+/Cu is +0.34 V, the reduction potentials in volts of the above electrodes follow the order

A
P > S > R > Q
B
S > R > Q > P
C
R > S > Q > P
D
P > Q > R > S
Question 7
Cr2O72– + I  → I2 + Cr3+

EѲcell = 0.79 V and EѲCr2O72– = 133 V. EѲ I2 is

A
0.54 V
B
– 0.54 V
C
+ 0.18 V
D
– 0.18 V
Question 8
Faraday’s constant is defined as
A
charge carried by 1 electron
B
charge carried by one mole of electrons
C
charge required to deposit one mole of a substance
D
charge carried by two moles of electrons
Question 9
How many moles of Pt may be deposited on the cathode when 0.80 F of electricity is passed through a 1.0 M solution of Pt4+?
A
1.0 mol
B
0.20 mol
C
0.40 mol
D
0.80 mol
Question 10
Molar ionic conductivities of a bivalent electrolyte are 57 and 73. The molar conductivity of the solution will be
A
130 S cm2 mol-1
B
65 S cm2 mol-1
C
260 S cm2 mol-1
D
187 S cm2 mol-1
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