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Faraday's Second Law

Silver is rem...

Question

Silver is removed electrolytically from $200 m L$ of a $0.1 N$ solution of $A g N O_{3}$ by a current of $0.1 A$ . How long will it take to remove half of the silver from the solution ?

A

0.1 s

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B

100 s

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C

965 s

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D

9650 s

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Solution

The correct option is C $9650 s$
Mmoles $A g N O_{3} = 0.1 \times 200 = 20$
$A g^{\oplus} + e^{-} \to A g$
For $50 %$ electrolysis, 10 mF is required
$\Rightarrow 10 m F = \frac{1 t}{96500} \Rightarrow t = 9650 s$

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