To test chemical oxygen demand (C.O.D.) of sewage, organic matter is o – McqOptions

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1.	To test chemical oxygen demand (C.O.D.) of sewage, organic matter is oxidised by potassium dichromate in the presence of
A.	ydrochloric acid
B.	ulphuric acid
C.	itric acid
D.	itric acid
Answer» C. itric acid

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