question_answer

Two voltameters, one of copper and another of silver, are joined in parallel. When a total charge q flows through the voltameters, equal amount of metals are deposited.   If   the   electrochemical equivalents of copper and silver are\[{{z}_{1}}\]and\[{{z}_{2}}\]respectively, the charge which flows through the silver voltameter is [AIEEE 2005]

A) \[\frac{q}{1+\frac{{{z}_{1}}}{{{z}_{2}}}}\]

B) \[\frac{q}{1+\frac{{{z}_{2}}}{{{z}_{1}}}}\]

C) \[q\frac{{{z}_{1}}}{{{z}_{2}}}\]          

D) \[q\frac{{{z}_{2}}}{{{z}_{1}}}\]

Correct Answer: B

Solution :

[b] We know

where,amount of metal deposited

chemical equivalent

charge

Now, the total charge,