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Question

In which of the following examples chemical effects of electric current is desirable?


A

Production of spark at the electrodes.

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B

Deposition of metal on the electrodes.

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C

Production of heat.

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D

Production of Light.

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Solution

The correct option is B

Deposition of metal on the electrodes.


When an electric current is passed through a solution, positive ions move towards the electrode which is connected to the negative terminal of the battery. The positive ions take electrons from the negative terminal and may get deposited at the electrode.


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