During the electrolysis of $NaCl$ solution,$H_2$ gas is liberated at the cathode when a $Pt$ electrode is used,whereas sodium amalgam is formed when a $Hg$ cathode is used. What is the reason for this?
- A$Hg$ is more inert than $Pt$.
- BMore voltage is required to reduce $H^+$ ions at a $Hg$ cathode than at a $Pt$ cathode.
- C$Na$ dissolves in $Hg$ while it does not dissolve in $Pt$.
- DThe concentration of $H^+$ is higher when a $Pt$ electrode is used.
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