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Cadmium amalgam is prepared by electroly...

Cadmium amalgam is prepared by electrolysis of a solution of `CdCl_(2)` using a mercury cathode. Find how long a current of 5 ampere should be passed in order to prepare 12% Cd-Hg amalgam on a cathode of 2 g mercury. At mass of Cd=112.40.

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The correct Answer is:
`t=93.65sec`.
`Cd^(2+)+2e^(-)toCd`
Cd required for 2 g of `Hg=(12xx2)/(88)=0.2727g`
`t=(2xx96500xx2727)/(1124xx5)=93.65sec`.
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