1436Civil EngineeringMedium
For detecting the nitrates in sewage, the colour may be developed by adding________?
ASulphuric acid and napthamine
BNone of these
CPotassium permanganate
DPhenol-di -sulphuric acid and potassium hydroxide
Correct answer
D. Phenol-di -sulphuric acid and potassium hydroxide
Explanation
The correct answer is Phenol-di -sulphuric acid and potassium hydroxide.