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Application of Electrolysis

Which metal c...

Question

Which metal can not obtained by electrolysis of their aqueous salt solution ?

A

Silver

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B

Magnesium

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C

Copper

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D

Platinum

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Solution

The correct option is B Magnesium
Highly reactive metals with lower reduction potentials than hydrogen are not obtained by electrolysis of aqueous solutions of their salts since their cations cannot be reduced at cathode in presence of water.Of the above metals, Magnesium is the only metal which has reduction potential less than that of Hydrogen.
Hence, Option "B" is the correct answer.

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