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B
Oxides of nitrogen
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C
Lead vapour
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D
Sewage
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Solution
The correct option is D Lead vapour The 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 aluminium cans, synthetic fibres, glass objects, iron products, and silver foils are non-biodegradable pollutants.