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Question

The chemical equivalent of copper and zinc are 32 and 108 respectively. When copper and silver voltameter are connected in series and electric current is passed through for sometimes, 1.6 g of copper is deposited. Then, the mass of silver deposited will be

A
3.5 g
B
5.4 g
C
None of these
D
2.8 g
Solution
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Correct option is C. 5.4 g
From Faraday’s law, m/E = constant
where m = mass of substance deposited, E =chemical equivalent. $$ \therefore \dfrac{m_{2}}{m_{1}} = \dfrac{E_{2}}{E_{1}} \Rightarrow m_{2} = \dfrac{108}{32} \times 1.6 = 5.4g $$

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