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  4. If the cathode is a Hg electrode, the maximum weight (in gram) of amalgam formed from this solution is

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Q. If the cathode is a $Hg$ electrode, the maximum weight (in gram) of amalgam formed from this solution is

IIT JEEIIT JEE 2007Some Basic Concepts of Chemistry

Solution:

At cathode : $ Na^+ + e^- \xrightarrow{\, \, \, Hg\, \, \, }\, \, Na(Hg)$
$ _{}^{Amalgam}$
Two moles of Na formed during electrolysis would produce two
moles of Na(Hg) amalgam.
$\Rightarrow $ mass of amalgam $= 2 \times (23+200)=446\, g$