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

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Solution

(d) formation of a precipitate

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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.

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(b) State some of the characteristics of chemical changes brought about by the chemical effect of electric current.
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Q. (a) What is meant by chemical reaction? Explain with the help of an example.
(b) Give one example each of a chemical reaction characterised by:
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(ii) change in colour
(iii) formation of a precipitate
(iv) change in temperature
(v) change in state.

When an electric current is passed through a cut potato for a considerable time, a coloured spot is formed around one of the electrodes :
(a) What is the colour of the spot?
(b) Around which electrode (positive or negative electrode) the coloured spot is formed?
(c) Which effect of electric current is involved in this case?

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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

(d) formation of a precipitate

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