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When an electric current is passes 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:

1. 2.0
2. 0.1
3. 0.5
4. 1.0

Correct answer: 1.0

Solution

The amount of hydrogen gas produced during electrolysis is directly related to the current and time, as described by Faraday's laws of electrolysis. Given that 112 mL of hydrogen gas corresponds to 0.005 moles, and using the formula I = nF/t, where F is Faraday's constant, the calculated current is 1.0 ampere.

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