Electrochemistry MCQ | Questions – Paper 6


Topic: Electrochemistry, Test No.: 06, Total MCQs: 10

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Question 1
The electrochemical equivalent of a metal is ‘x’ gram-coulomb–1. The equivalent weight of metal is
A
x
B
x × 96500
C
x/96500
D
1.6 × 10−19 × x
Question 2
The equivalent conductivity of 0.1 M weak acid is 100 times less than that at infinite dilution. The degree of dissociation is
A
100
B
10
C
0.01
D
0.001
Question 3
One ampere of current is passed for 9650 seconds through molten AlCl3. What is the weight in grams of Al deposited at cathode? (Atomic weight of Al=27)
A
0.9
B
9.0
C
0.09
D
90.0
Question 4
One faraday of electricity is passed separately through one litre of one molar aqueous solution of (i) AgNO3, (ii) SnCl4 and (iii) CuSO4. The number of moles of Ag, Sn and Cu deposited at cathode are respectively
A
1.0, 0.25, 0.5
B
1.0, 0.5, 0.25
C
0.5, 1.0, 0.25
D
0.25, 0.5, 1.0
Question 5
One Faraday of electricity is passed through molten Al2O3, aqueous solution of CuSO4 and molten NaCl taken is three different electrolytic cells connected in series. The mole ratio of Al, Cu and Na deposited at the respective cathode is
A
2 : 3 : 6
B
6 : 2 : 3
C
6 : 3 : 2
D
1 : 2 : 3
Question 6
Several blocks of magnesium are fixed to the bottom of a ship to
A
prevent action of water and salt
B
keep away the sharks
C
prevent puncturing by under-sea rocks
D
make the ship lighter
Question 7

Standard electrode potentials are:

Fe2+ | Fe (Eo = -0.44 V), Fe3+ | Fe2+ (Eo = 0.77 V)

Fe2+, Fe3+ and Fe blocks are kept together, then

A
Fe3+ increases
B
Fe3+ decreases
C
Fe2+/Fe3+ remains unchanged
D
Fe2+ decreases
Question 8
The best way to prevent rusting of iron is
A
putting it in an acidic solution
B
making iron cathode
C
both (A) and (B)
D
neither (A) nor (B)
Question 9

The half cell reaction, with its standard reduction potentials are:

(i) Pb2+ + 2e- Pb (E° = -0.13 V)

(ii) Ag+ + e- Ag (E° = +0.80 V)

Which of the following reactions will occur?

A
Pb2+ + 2Ag 2Ag+ + Pb
B
Pb2+ + H2 2H+ + Pb
C
2H+ + 2Ag 2Ag+ + H2
D
2Ag+ + Pb Pb+ + 2Ag
Question 10
The laws of electrolysis were proposed by
A
Fritz Haber
B
Michael Faraday
C
Friedrich Kohlrausch
D
Richard Abegg
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