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Question

When electric current is passed through acidified water,112 mL of hydrogen gas at N.T.P. was collected at the cathode in 965 seconds.The current passed, in ampere, is:

A
1
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B
0.5
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C
0.1
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D
2
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Solution

The correct option is A 1
As we know that,
22400 ml of hydrogen = 1 mole=2 g
So, 112 ml of hydrogen contains = 2×11222400=102 g
Now,
2H++2eH2
By Faraday's Law
nF=1 mole
So, 2 g is deposited by 2×96500C
0.2 g will be deposited by 2×96500×1022=965C
Current = Chargetime=965C965s=1A
Thus, the current passed is 1A

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