For the COD test of sewage, organic matter is oxidised by K₂Cr₂O� – McqOptions

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1.	For the COD test of sewage, organic matter is oxidised by K₂Cr₂O₇ in the presence of
A.	₂SO₄
B.	NO₃
C.	Cl
D.	one of these
Answer» B. NO₃

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