For the COD test of sewage, organic matter is oxidised by K2Cr207 in t – McqOptions

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1.	For the COD test of sewage, organic matter is oxidised by K2Cr207 in the presence of
A.	H2SO4
B.	HNO3
C.	HCl
D.	none of these.
Answer» B. HNO3

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