Select the correct statement(s) about electrolysis.

Electric current is used to drive a non-spontaneous reaction.

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△ G

is positive for chemical process during electrolysis.

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Cations and anions move towards anode and cathode respectively.

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Over voltage is generally associated with evolution of

O_{2}

gas.

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Solution

The correct options are
A Electric current is used to drive a non-spontaneous reaction.
B $△ G$ is positive for chemical process during electrolysis.
C Over voltage is generally associated with evolution of $O_{2}$ gas.
The process of decomposition of an electrolyte by the passage of electricity is called electrolysis or electrolytic dissociation. It is carried out in electrolytic cell where electrical energy is converted into chemical energy. As this process is non-spontaneous, so G is positive for chemical process during electrolysis.
In case of gases like hydrogen and oxygen, the discharge potentials are appreciably higher than their reversible electrode potential. The excess voltage is referred to as over voltage of the gas.

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