The passage of electric current through an electrolyte causes
(a) chemical changes.
(b) rise in temperature.
(c) physical changes.
(d) evolution of gas in all cases.

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Solution

(a) chemical changes
The passage of electric current through an electrolyte causes chemical changes.

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Question 3

A chemical change may involve
(a) change in colour only
(b) change in temperature only
(c) evolution of gas only
(d) All of the these

Which of the following are physical changes and which are chemical changes?

(a) Burning of a magnesium wire

(b) Freezing of water

(d) Glowing of an electric bulb

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