1
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Question

# When an electric current is passed through acidified water, 112 ml of hydrogen gas at STP collects at the cathode in 965 seconds. What is the current passed, in ampere?

A
1.0
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B
0.5
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C
0.1
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D
2.0
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Solution

## The correct option is B 1.0At STP, 22.4 litres=1mole of H2 gas=2g of H2 gas.∴ 112 ml of H2 gas contains 2×11222.4×103=0.01g of H2 gasNow, 2H++2e−→H2According to Faraday's law, nF=1molewhere, F= Faraday's constant=96500 C& n=numberofelectrons=2∴ 1 mole deposits 2×96500C0.01g deposits 2×96500×0.012=965 C∴ Current =ChargeTime=965965 =1AmpereHence, option (A) is correct.

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