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Asked by Chunna Last Modified
Answer 
Manisha
A compound can show variations in its chemical reactions if it have variable oxidation state...if a compound increases its O. S during rxn it acts as reducing agent and if it decreases its O.S during the rxn then it acts as oxidising agent. In SO2 the O.S of sulphur is +4 and can increase upto +6 and decrease upto 0 in chemical rxns similarly the O.S of oxygen can vary from -2 to 0 and in H2O2 the O.S of oxygen is -1 . Hence both can act as oxidising as well as reducing agent while this is not the case in HNO3 and O3 because nitrogen and oxygen are present in their maximum +5 and 0 respectively and can only go for decrease of their O.S and so they can only acts as oxidising agents.
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