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Two platinum electrodes were immersed in a solution of `CuSO_(4)` and electric current was passed through the solution. After some time, it was found that colour of `CuSO_(4)` disappeared with evolution of gas at the electrode. The colourless solution contains.
A. Platinum sulphate
B. Copper sulphate
C. Copper hydroxide
D. Sulphuric acid

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Best answer
Correct Answer - D
`2Cu^(+2)overset(+4e^(-))rarr2Cu` (cathode)
`2H_(2)O overset(-4e^(-))rarrO_(2)uparrow+4H^(+)("anode")2H^(+)+SO_(4)^(-2) rarrH_(2)SO_(4)`

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