hno3 can act as only oxidising agent while nh3 can act only as reducing agent ?
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Nitrogen can have oxidation numbers from −3 to +5. The oxidation number fo nitrogen in HNO 3 is +5. Thus, increase in oxidation number beyond +5 cannot occur. Hence, HNO 3 cannot act as reducing agent. The oxidation number of nitrogen in HNO 3 can only decrease; thus it acts as an oxidising agent. In HNO 2 , the oxidation number of nitrogen is +3. Thus, it can increase or decrease within the range −3 to +5. Hence, it can act as an oxidising as well as a reducing agent.
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