Direction for: In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as
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.A) If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
B) If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
C) If Assertion is true but Reason is false.
D) If both Assertion and Reason are false.
Correct Answer: A
Solution :
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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