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For detecting the nitrites in the sewage, the matching colour may be developed by adding_________________?

/ Civil Engineering Mcqs, Waste Water Engineering / By
For detecting the nitrites in the sewage, the matching colour may be developed by adding_________________?

A. Potassium permanganate
B. Sulphuric acid and napthamine
C. Phenol-di -sulphuric acid potassium hydroxide
D. None of these