Q.

Which of the following does not cause water pollution?

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a

Wastes from refineries

b

Residues from mills

c

Respiratory gas

d

Chemicals from factories

answer is C.

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Detailed Solution

Respiratory gas does not cause water pollution.

The water released from mills, factories, and refineries consists of toxic chemicals which have the potential to alter the natural composition of the water thus making it polluted.

The water also permits the growth of algae and other microorganisms.

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