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Question

The ratio of the volumes of hydrogen and oxygen obtained on electrolysis of water is ____.

A
2:1
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B
1:3
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C
4:3
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D
1:2
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Solution

The correct option is A 2:1
The chemical formula of water is H2O. On electrolysis, water decomposes to produce hydrogen and oxygen gases as shown below:

2H2O (l) 2H2 (g) + O2 (g)

The ratio of the volumes of hydrogen and oxygen obtained on electrolysis of water is 2:1. This is because, one molecule of water contains two hydrogen atoms and one oxygen atom in it.

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