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Question

In the electrolysis of an aqueous solution of NaOH,2.8 litre of oxygen gas at NTP was liberated at anode. How much of hydrogen gas was liberated at cathode?

A
2.8 litre
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B
5.6 litre
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C
11.2 litre
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D
22.4 litre
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Solution

The correct option is C 5.6 litre
Electrolysis of NaOH:

Anode:
4OHO2(g)+2H2O+4e

Cathode:-
4H2O+4e2H2+4OH

H2:O2

Ratio:- 2:1

The volume of H2 liberated will be twice of

O2.

Volume of O22.8litre

Volume of H25.6litre.

Hence, te correct option is B

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