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Chemical Reaction

The electroly...

Question

The electrolytic decomposition of water gives $H_{2}$ and $O_{2}$ in the ratio of

1:2 by volume

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2:1 by volume

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8:1 by mass

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1:2 by mass

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Solution

The correct option is B 2:1 by volume
On electrolysis, water decomposes according to the reaction, $2 H_{2} O_{(l)} \to 2 H_{2 (g)} + O_{2 (g)}$ .
Thus, water decomposes to give hydrogen and oxygen in the ratio 2:1 by volume. The double volume of the gas collected is hydrogen.

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