Potassium permanganate
Sulphuric acid and napthamine
Phenol-di -sulphuric acid and potassium hydroxide
None of these
Answer is Right!
Answer is Wrong!
The correct answer is: A. Potassium permanganate.
Potassium permanganate is a strong oxidizing agent that can be used to detect the presence of nitrates in sewage. When potassium permanganate is added to a solution of nitrates, it will react with the nitrates to form a brown precipitate. The amount of brown precipitate that forms will be proportional to the concentration of nitrates in the solution.
Sulphuric acid and napthamine are not effective in detecting the presence of nitrates. Phenol-di -sulphuric acid and potassium hydroxide are also not effective in detecting the presence of nitrates.
Here is a more detailed explanation of each option:
- Option A: Potassium permanganate is a strong oxidizing agent that can be used to detect the presence of nitrates in sewage. When potassium permanganate is added to a solution of nitrates, it will react with the nitrates to form a brown precipitate. The amount of brown precipitate that forms will be proportional to the concentration of nitrates in the solution.
- Option B: Sulphuric acid and napthamine are not effective in detecting the presence of nitrates. Sulphuric acid is a strong acid that can react with many different substances, including nitrates. However, the reaction between sulphuric acid and nitrates does not produce a visible change that can be used to detect the presence of nitrates. Napthamine is a colorless organic compound that does not react with nitrates. Therefore, sulphuric acid and napthamine cannot be used to detect the presence of nitrates.
- Option C: Phenol-di -sulphuric acid and potassium hydroxide are also not effective in detecting the presence of nitrates. Phenol-di -sulphuric acid is a strong acid that can react with many different substances, including nitrates. However, the reaction between phenol-di -sulphuric acid and nitrates does not produce a visible change that can be used to detect the presence of nitrates. Potassium hydroxide is a strong base that can react with many different substances, including nitrates. However, the reaction between potassium hydroxide and nitrates does not produce a visible change that can be used to detect the presence of nitrates. Therefore, phenol-di -sulphuric acid and potassium hydroxide cannot be used to detect the presence of nitrates.