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Electrolysis and Electrolytes

In electrolys...

Question

In electrolysis of water, why is volume of gas collected double that of collected over the other electrode?

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Solution

$2 H_{2} O (l) e l e c t r i c i t y H_{2} S O_{4} - ---------- \to 2 H_{2} (g) + O_{2} (g)$

It can be observed from the balanced chemical equation that the volumes of hydrogen and oxygen produced during electrolysis are in the ratio 2:1.

Thus, the volume of hydrogen gas collected in the process is double than that of oxygen.

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