Assertion : At the end of electrolysis using Pt electrodes, an aqueous solution of `CuSO_(4)` turns colorless.
Reason: `CuSO_(4)` changes to `Cu(OH)_(2)` during electrolysis.

Options

A. If both (A) and (R) are correct and (R) is the correct explanation of (A).
B. If both (A) and (R) are correct, but (R) is not the correct explanation of (A).
C. If (A) is correct, but (R) is incorrect
D. If both (A) and (R) are incorrect.

Answer

C

Explanation

Since `Cu^(2+)` ions are reduced to Cu and deposited at cathode `H_(2)O` is oxidized at anode (`SO_(4)^(2-)` is not oxidized)
`2H+SO_(4)^(2-)rarrH_(2)SO_(4)` The solution become becomes colured due to the formation of `H_(2)SO_(4)` in solution