JEE MainChemistryElectrochemistryMCQ+4 / −1
When an electric currents 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 :
- A1.0
- B0.5
- C0.1
- D2.0
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Correct answer: A
- Reaction at the cathode
In electrolysis of acidified water, hydrogen is produced at the cathode:
So, 1 mole of requires 2 moles of electrons.
- Moles of hydrogen collected
At N.T.P., mole of gas occupies .
Given volume of hydrogen:
Hence,
- Moles of electrons required
From the cathode reaction:
Therefore,
- Total charge passed
Using Faraday constant,
So charge passed:
- Calculate current
Given time:
Using
- Match with options
The correct option is:
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