For the COD test of sewage, organic matter is oxidised by K2Cr2O7 in t – McqOptions

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1.	For the COD test of sewage, organic matter is oxidised by K2Cr2O7 in the presence of________________?
A.	H2SO4
B.	HNO3
C.	HCl
D.	None of these
Answer» B. HNO3

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