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8.8. While sulphur dioxide and hydrogen peroxide can act as an oxidising as well as reducing agents in their reactions, ozone and nitric acid act only as oxidants. Why?

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    Answered by

    Vishal Baghel | Contributor-Level 10

    4 months ago

    (i) In SO2, O.N. of S is +4. In principle, S can have a minimum O.N. of -2 and maximum of +6. Therefore, S in SO2 can either decrease or increase its O.N. and hence can act both as an oxidising as well as a reducing agent.

    (ii) In H2O2, the O.N. of O is -1. In principle, O can have a minimum O.N. of -2 and maximum of zero (+1 is possible in O2F2 and +2 in OF2). Therefore, O in H2O2 can either decrease its O.N. from -1 to -2 or can increase its O.N. from -1 to zero. Therefore, H2O2 acts both as an oxidising as well as a reducing agent.

    (iii) In O3, the O.N. of O is zero. It can only decrease its O.N. from zero to -1 or -

    ...more

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