Q40 of 54 Page 351

Which of the following is usually not a water pollutant?

Fly ash is the air pollutant which is produced by the insufficient burning of fuels which enters into the atmosphere causing air pollution.

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38

Drinking water can be made absolutely safe by adding some:

 39

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:

 41

Which of the following are used in electric water filters to kill all the harmful micro-organisms present in tap water and make it absolutely safe for drinking?

 42

Which of the following is not an air pollutant?