Assertion :In a redox reaction, the oxidation number of oxidant decreases while that of reductant increases. Reason: Oxidant gains electron(s) and reductant loses electrons(s).

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 but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
During a redox reaction, the oxidant gains electrons and is reduced. Hence, its oxidation number decreases.
Also, the reductant loses electrons and is oxidized. Its oxidation number increases.

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