why does the colour of the solution changes when the electric current is passed through it?

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Solution

1. When current is passed through a coloured solution,the colour imparting constituents change their property due to the chemical effect of electric current and the solution becomes colourless.
2. For e.g when current is passed through a solution of CuSO₄ its blue colour fades away and rusty brown copper metal gets deposited. This is due to chemical effects of electric current.

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