Home » mcq » Civil engineering » Waste water engineering » 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
Potassium permanganate
Sulphuric acid and napthamine
Phenol-di -sulphuric acid potassium hydroxide
None of these
Answer is Wrong!
Answer is Right!
The correct answer is: A. Potassium permanganate.
Nitrites are detected in sewage by adding potassium permanganate. The potassium permanganate reacts with the nitrites to form a purple color. The intensity
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of the purple color is proportional to the concentration of nitrites in the sewage.
Sulphuric acid and napthamine are not used to detect nitrites in sewage. Phenol-di -sulphuric acid potassium hydroxide is also not used to detect nitrites in sewage.
Here is a more detailed explanation of each option:
- Option A: Potassium permanganate is a strong oxidizing agent. When it is added to sewage, it reacts with the nitrites to form a purple color. The intensity of the purple color is proportional to the concentration of nitrites in the sewage.
- Option B: Sulphuric acid and napthamine are not used to detect nitrites in sewage. Sulphuric acid is a strong acid, and napthamine is a base. When they are mixed together, they react to form a salt. This salt does not react with nitrites to form a purple color.
- Option C: Phenol-di -sulphuric acid potassium hydroxide is also not used to detect nitrites in sewage. Phenol-di -sulphuric acid is a strong acid, and potassium hydroxide is a base. When they are mixed together, they react to form a salt. This salt does not react with nitrites to form a purple color.
Therefore, the correct answer is: A. Potassium permanganate.