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  4. In the electrolysis of water, one faraday of electrical energy would evolve

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Q. In the electrolysis of water, one faraday of electrical energy would evolve

AMUAMU 2006

Solution:

Hydrolysis of water can be represented by the following equations
$2 H _{2} O \rightleftharpoons O _{2}+4 H ^{+}+4 e^{-}$
$\because 4$ faraday of charge liberate $O _{2}=32\, g$
$\therefore 1$ faraday of charge liberate $O _{2}=\frac{32}{4}=8\, g$