five chemical impurities in five rivers of India
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2
Phosphorus, NO2, radon, metallic oxides, Pb, Hg etc
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1) Metallic oxides
2) Mercury
3) Lead
4) Hexachlorobenzene (HCB)
5) DDT
2) Mercury
3) Lead
4) Hexachlorobenzene (HCB)
5) DDT
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