Which of the following are non-degradable pollutants?

Mercuric salts

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Long chain phenolics

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DDT

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All of the above

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Solution

The correct option is D All of the above
Those pollutants, which cannot be broken down into simpler, harmless substances in nature, are called non-biodegradable pollutants. DDT, plastics, polythene, bags, insecticides, pesticides, mercury, lead, arsenic, metal articles like aluminum cans, synthetic fibres, glass objects, iron products and silver foils are non-biodegradable pollutants.

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