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Assertion: In the electrolysis of aqueou...

Assertion: In the electrolysis of aqueous NaCl, Na is preferentially discharged at mercury cathode forming sodium amalgam.
Reason: It is due to the fact that hydrogen gas a high over voltage at mercury cathode.

A

If both assertion and reason are true and the reason is the correct explanation of the assertion.

B

If both assertion and reason are true but reason is not the correct explanation of the assertion.

C

If assertion is true but reason is false.

D

If the assertion and reason both are false.

Text Solution

Verified by Experts

The correct Answer is:
A
In the electrolysis of aq. NaCl, sodium is preferentially discharged at the mercury cathode forming sodium amalgam (Na–Hg) due to the fact that hydrogen has a high over voltage at mercury cathode
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