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Faraday's First Law

A certain qua...

Question

A certain quantity of electricity is passed through an aqueous solution of $A g N O_{3}$ and cupric salt solution connected in series. The amount of silver deposited is 1.08 g. The amount of copper deposited is :
[At.wt. of $C u = 63.54; A g = 108$ ]

A

0.6454 g

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B

6.354 g

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C

0.3177 g

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D

3.177 g

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Solution

The correct option is B $0.3177 g$
Equivalent weight of silver $= 108$ g/eq

Equivalent weight of copper $= 31.77$ g/eq

Mass of $A g$ deposited $= 1.08$ g

Substituting values in the following equation:

$\frac{M a s s o f C u d e p o s i t e d}{M a s s o f A g d e p o s i t e d} = \frac{E q . W t o f C u}{E q . W t o f A g}$

$\frac{M a s s o f C u d e p o s i t e d}{1.08} = \frac{31.77}{108}$

$M a s s o f C u d e p o s i t e d = \frac{31.77}{108} \times 1.08 = 0.3177$ g.

Hence, option C is correct.

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