O Level Biology MCQs – Certification Test 1311

Pollution: Sewage as Cause MCQ (Question 1311) – App & e-Book Download

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MCQ 1311: Hydrogen sulfide (H₂S) and ammonia (NH₃) are produced from:

the chimneys of factories
use of chlorofluorocarbon in foam packaging
decomposition of organic compounds by anaerobic bacteria
treatment of acidic wastes with alkalis

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