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For the COD test of sewage, organic matter is oxidised by K2Cr2O7 in the presence of________________?

/ Civil Engineering Mcqs, Waste Water Engineering / By
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