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Question

A direct current deposits 54 g of silver during electrolysis. How much amount of aluminium would be deposited from aluminium chloride solution by the same amount of electricity?
( Atomic mass of Ag =108 g/mol)
(Atomic mass of Al=27 g/mol)

A
4.5 g
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B
5.4 g
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C
54 g
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D
2.7 g
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Solution

The correct option is A 4.5 g
Faradays second law of electrolysis
If equal amount of charge (Q) is passed through two different solutions, the amount of substance deposited/liberated (W) is proportional to their chemical equivalent weights (E).

Thus,
W1W2=E1E2=Z1Z2

Equivalent mass of silver =108 g equiv1
Equivalent mass of aluminium in AlCl3=273=9 g equiv1

WAgWAl=EAgEAl

54WAl=1089

WAl=4.5 g



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