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Control of river pollution can be done by providing the extra ___________ during dry season.

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Control of river pollution can be done by providing the extra ___________ during dry season.

(a) Water

(b) Nitrogen

(c) Carbondioxide

(d) Oxygen

I got this question in an interview.

Question is from Monitoring and Control of Water Pollution in portion Water of Applied Chemistry

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Right option is (d) Oxygen

The explanation: By providing the oxygen to the water in dry season will reduce the pollution of the rivers.

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