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If mercury is...

Question

If mercury is used as cathode in the electrolysis of aqueous NaCl solution ,the ion discharged at cathode is?

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Solution

Hi,
In the electrolysis of molten sodium chloride using a mercury cathode, sodium ions are discharged in preference to hydrogen ions which are lower in the series.
Thanks
SME team
BYJUS

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Similar questions

If mercury is used as cathode in the electrolysis of $N a C l$ solution, the ions discharged at cathode are:

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

Q. Answer in one word.
Which gas is evolved at cathode during the electrolysis of an aqueous solution of

N a C l

Q. During the electrolysis of an aqueous solution

N a C l

, hydrogen ion is reduced at the cathode and not the sodium ion through both

N a^{+}

H^{+}

ions are present inn the solution, why?

Q. Assertion :Alkali metals are obtained by electrolysis of molten salt and not aqueous solution. Reason: The discharge potential of H ions is lower than alkali metal cation hence hydrogen is discharged at cathode instead of metal.

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