Q31 of 76 Page 271

Explain why, distilled water does not conduct electricity but tap water conducts some electricity.

Distilled water does not conduct electricity because it does not contain any ions which make it conducting. But it can conduct electricity when a pinch of common salt is added to it, as salt solution is conducting in nature.

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29

Which effect of electric current is utilized for detecting the flow of current through a solution:

(a) when a torch bulb is used?


(b) when a compass is used?

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What happens to the needle of a compass kept nearby when electric current is switched on in a wire? Why does this happen?

 32

Distilled water does not conduct electricity. What substances can be added to distilled .water in small amounts to make it a good conductor of electricity? Why?

 33

Which of the two is a better conductor of electricity: drinking water (tap water) or sea water? Give reason for your answer.