Assertion :Oxygen atom in both , $O_{2}$ and $O_{3}$ has an oxidation number of -2 Reason: Oxygen is assigned an oxidation number -2 in all of its compounds.

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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Both Assertion and Reason are incorrect

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Solution

The correct option is D Both Assertion and Reason are incorrect
In all elements, when in the free state, each atom bears an oxidation number of zero.,
Oxidation number of oxygen in most of its compounds is -2 with two exceptions : in peroxides , oxidation number of oxygen is -1 and in superoxides , oxidation number of oxygen is $- \frac{1}{2} .$

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