How HNO3 is strong oxidising agent ?
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In nitric acid, the oxidation state of nitrogen is +5, that is the maximum oxidation state nitrogen can acquire in a compound. ... In case of nitrous acid, the oxidation state of nitrogen is +2. So it can get oxidised to +5 state and also get reduced to -3 state. Thus, it can act as both reducing agent and oxidising agent.
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Therefore, nitric acid can only act as an oxidising agent because it itself gets reduced. In case of nitrous acid, the oxidation state of nitrogen is +2. So it can get oxidised to +5 state and also get reduced to -3 state. Thus, it can act as both reducing agent and oxidising agent.
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