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.	Hydrochloric acid
B.	Sulphuric acid
C.	Nitric acid
D.	Citric acid
Answer» C. Nitric acid

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