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  4. Assertion: Sodium ions are discharged in preference to hydrogen ions at a mercury cathode. Reason: The nature of cathode can affect the order of discharge of cations.

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Q. Assertion: Sodium ions are discharged in preference to hydrogen ions at a mercury cathode.
Reason: The nature of cathode can affect the order of discharge of cations.

AIIMSAIIMS 1996Electrochemistry

Solution:

Hydrogen ions are discharged in preference to sodium normally but at mercury electrode, sodium ion are discharged first due to the formation of amalgam $(Na / Hg)$.