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Answer : 3 nitrous acid Explanation : Answer: C) nitrous acid Explanation: Nitrous acid act as an oxidising agent because it oxidises potassium iodide to iodine. It is also a reducing agent because it decolourises acidified potassium permanganate solution.Nitric acid acts only as an oxidising agentAmmonia acts only as a reducing agentNitrogen peroxide acts only as an oxidising agent.

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