State some of the characteristics of chemical changes brought about by the chemical effect of electric
current
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(a) When electric current is passed through water, water dissociates into hydrogen and oxygen. Hydrogen is deposited over negative pole and oxygen is deposited over positive pole. Deposition of hydrogen and oxygen at different poles is visible in the form of bubbles.
(b) When electric current is passed through the solution of a metal salt, such as solution of copper sulphate, metal gets deposited at the negative pole, because metal is positively charged.
(c) Sometimes, the colour of solution also changes when electric current passes through it.
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