The correct answer is: Potassium Permanganate is used for purifying drinking water, because it is an oxidising agent.
Potassium permanganate is a strong oxidising agent. It can oxidise organic matter, such as bacteria, viruses, and parasites, to harmless compounds. It can also oxidise inorganic matter, such as iron and manganese, to precipitate them out of the water. This makes potassium permanganate an effective agent for purifying drinking water.
Option A is incorrect because potassium permanganate is not a sterilising agent. Sterilising agents kill all living organisms, including bacteria, viruses, and parasites. Potassium permanganate does not kill all living organisms, but it does oxidise them to harmless compounds.
Option B is incorrect because potassium permanganate does not dissolve the impurities of water. It oxidises them to precipitate them out of the water.
Option C is incorrect because potassium permanganate is not a reducing agent. Reducing agents are substances that donate electrons to other substances. Potassium permanganate is an oxidising agent, which means it accepts electrons from other substances.
I hope this helps! Let me know if you have any other questions.