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Which one of the following metals can no...

Which one of the following metals can not be obtained on electrolysis of aqueous solution of its salts?

A

Cu

B

Na

C

Mg

D

K

Text Solution

Verified by Experts

The correct Answer is:
A
Na, K and Mg are placed above hydrogen in the electrochemical series. When the aqueous solutions of these salts are electrolysed, hydrogen is released at the cathode instead of the respective metals.
Cu is placed below hydrogen in the electrochemical series, when aqueous solution of copper is electrolysed, copper is deposited at the cathode.
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