जलीय प्रदूषण में कौन सा का� – McqOptions

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1.	जलीय प्रदूषण में कौन सा कारक प्रमुख है -
A.	धुआँ
B.	औद्योगिक रसायन
C.	अमोनिया
D.	साबुन
Answer» C. अमोनिया

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