First slide

Applications of complexes

Question

An article to be electroplated by silver is taken as cathode during electrolysis. The electrolyte to be taken during this process would be

Easy

A

$AgCl$
B

${AgNO}_{3}$
C

$K [Ag {(CN)}_{2}]$
D

${Ag}_{2} S_{2} O_{3}$

Solution

Only small amounts of ‘Ag’ is required to electroplate the articles, a layer of silver is required;
So Silver ion must not be freely available.Only small amounts of Silver ion must be obtained from the electrolyte;
Silver ion if present as a complex cannot be ionized easily. Very little amount of it will be available due to decomposition of complex ion;
So a complex salt, $K [Ag {(CN)}_{2}]$ of silver is selected as the electrolyte;

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