Question

Assertion. In the electrolysis of aqueous NaCl,Na is preferentially discharged at mercury cathode forming sodium amalgam.

Answer 1

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 has a high over voltage at mercury cathode.



Answer:
(a) If both assertion and reason are true and reason is the true explanation of the assertion.