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Faraday's Second Law

0.8g of Cu ...

Question

$0.8 g$ of $C u$ displace $27 g$ $A g$ from aq.solution of ${A g N O}_{3}$ .If equivalent wt.of copper is $32 g$ . then equivalent weight of silver is:

320 g

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180 g

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160 g

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108 g

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Solution

The correct option is D $108 g$
From second law,
$\frac{m_{1}}{E_{1}} = \frac{m_{2}}{E_{2}}$
$\frac{0.8}{32} = \frac{2.7}{E_{2}}$
$E_{2} = \frac{2.7}{0.8} \times 32$
$E_{2} = 108 g$

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