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