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Match the following.
Sewage from different sources Prime contaminant(s)
A Industrial sewage i Organic matter
B Domestic sewage ii Nitrates
C Hospital wastes iii Heavy metals
D Agricultural wastes iv Pathogens
(a) (b) (c) (d)
1. ii i iv iii
2. iii iv ii i
3 i iii iv ii
4. iii i iv ii

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answer is D.

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Detailed Solution

Industrial sewage	Heavy metals like mercury, cadmium, copper, lead, etc.
Domestic sewage	Biodegradable organic matter
Hospital wastes	Pathogens
Agricultural wastes	Nitrates and phosphates

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