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Question
Which of these are biodegradable pollutants?
(i) Pesticides
(ii) Mercuric salts
(iii) Sewage
(iv) Radioactive wastes
Options
(i) and (ii)
(i) and (iii)
(i), (iii) and (iv)
(iii) only
MCQ
Solution
(iii) only
Explanation:
Only sewage is biodegradable.
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