Assertion : $O_{3}$ can act as an oxidising agent as well as a reducing agent but $S O_{2}$ can act only as an oxidant. Reason: The oxidation number of $O$ in $O_{3}$ is zero and the oxidation number of $S$ in $S O_{2}$ is +4.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect and Reason is correct

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Solution

The correct option is D Assertion is incorrect and Reason is correct
The oxidation number of $O$ in $O_{3}$ is zero.
It can only decrease from zero to -1 or -2 but cannot increase to +2.
Therefore, it can act as an oxidant only.
In $S O_{2}$ , the oxidation number of $S$ is +4.
It can have a minimum oxidation number of -2 and maximum of +6.
Its oxidation number either decreases or increases and hence, it can act both as an oxidising and a reducing agent.

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Assertion :O3 can act as an oxidising agent as well as a reducing agent but SO2 can act only as an oxidant. Reason: The oxidation number of O in O3 is zero and the oxidation number of S in SO2 is +4.

Assertion : $O_{3}$ can act as an oxidising agent as well as a reducing agent but $S O_{2}$ can act only as an oxidant. Reason: The oxidation number of $O$ in $O_{3}$ is zero and the oxidation number of $S$ in $S O_{2}$ is +4.