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

Production of spark at the electrodes.

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Deposition of metal on the electrodes.

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Production of heat.

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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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Similar questions

Which of the following effects is not produced by the chemical reactions brought about by an electric current ?
(a) bubbles of gases on electrodes
(b) deposits of metals on electrodes
(c) change in colour of solution
(d) formation of a precipitate

Q. The formation of bubbles at electrodes during electrolysis is an example of the chemical effect of electrical current.

Q. An electric current is passed through a conducting solution. Following are some observations:
(i) Deposits of metal may be seen on the electrodes.
(ii) Solution may get heated.
(iii) Bubbles of gas may be formed on the electrodes.

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

Q. Solutions of alkali metals in liquid ammonia at

- 33^{o} C

conduct electricity without chemical reaction at the electrodes. Hence, conductivity should :

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