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
x | |
x × 96500 | |
x/96500 | |
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
100 | |
10 | |
0.01 | |
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)
0.9 | |
9.0 | |
0.09 | |
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
1.0, 0.25, 0.5 | |
1.0, 0.5, 0.25 | |
0.5, 1.0, 0.25 | |
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
2 : 3 : 6 | |
6 : 2 : 3 | |
6 : 3 : 2 | |
1 : 2 : 3 |
Question 6 |
Several blocks
of magnesium are fixed to the bottom of a ship to
prevent action of water and salt | |
keep away the sharks | |
prevent puncturing by under-sea rocks | |
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
Fe3+
increases | |
Fe3+
decreases | |
Fe2+/Fe3+
remains unchanged | |
Fe2+
decreases |
Question 8 |
The best way
to prevent rusting of iron is
putting it in an acidic solution | |
making iron cathode | |
both (A) and (B) | |
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?
Pb2+
+ 2Ag → 2Ag+ + Pb | |
Pb2+
+ H2 → 2H+ + Pb | |
2H+
+ 2Ag → 2Ag+ + H2 | |
2Ag+
+ Pb → Pb+ + 2Ag |
Question 10 |
The laws of
electrolysis were proposed by
Fritz Haber | |
Michael Faraday | |
Friedrich Kohlrausch | |
Richard Abegg |
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