Q38 of 54 Page 351

Drinking water can be made absolutely safe by adding some:

Chlorination can be done by adding chlorine tablets or bleaching powder into water. Only specific number of chlorine tablets should be used.

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Which of the following disease cannot be caused by drinking of river water contaminated with untreated sewage?

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Which of the following statement about ozone is correct?

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The excessive use of one of the following in agriculture can cause the death of fish in a pond by oxygen starvation. This one is:

 40

Which of the following is usually not a water pollutant?