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Electrochemical Series

Which one of ...

Question

Which one of the following metals cannot be obtained by electrolysis of aqueous solution of its salts?

A

Ag

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B

Mg

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C

Cu

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D

Cr

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Solution

The correct option is B
Mg

The reduction potential of Mg is less than that of water $E^{o} = - 0.083 V$ .
Hence, in its aqueous solution instead of Mg, water gets reduced to $H_{2}$ as per the following reaction:

$2 H_{2} O + 2 e^{-} \to H_{2} + 2 O H^{-}$

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