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Question

When 1F of electricity is passed through acidulated water, O2 evolved is:

A
11.2dm3
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B
5.6dm3
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C
1.0dm3
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D
22.4dm3
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Solution

The correct option is A 5.6dm3
2H2O4H++2O2
2O2O2+4e
4H++4e2H2
n=4
hence, 4F charge will liberate
=1 mole oxygen =22.4 dm3 oxygen
1F charge will liberate 22.44=5.6dm3 O2

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