Q.

Which of the following cannot be extracted by electrolysis from aqueous solution of their salts?

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a

Zn

b

Pt

c

Ag

d

Cu

answer is A.

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Detailed Solution

Cathode is where reduction process takes place and the element that has higher reduction potential acts as a cathode.

Zn cannot be obtained by the electrolysis of aqueous solution of their salts and instead of metal, H2 gas is liberated at a cathode because  EZn2+/Zn °< EH+/H2°.

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