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 overvoltage at mercury cathode .

Assertion . In the electrolysis of aqueous NaCl , Na is preferentially

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 overvoltage at mercury cathode .
Answer» If both ASSERTION and REASON are TRUE, and reason is the true EXPLANATION of the assertion. If both assertion and reason are true, but reason is not the true explanation of the assertion. If assertion is true, but reason is false If both assertion and reason are false. Answer :a