Assertion :Carbon can exhibit an oxidation state of zero in some of its compounds. Reason: Oxidising agent undergoes decrease in oxidation number during redox reaction.

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 B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Carbon has a valency of four. Thus, it is possible that out of four atoms attached to the carbon, two have an oxidation number of +1 each and the remaining two atoms have the oxidation number of -1 each. Hence, the oxidation number of carbon will be $2 (+ 1) + 2 (- 1) = 0$ . For example, the oxidation number of carbon in $C H_{2} C l_{2}$ is 0.

During the redox reaction, the oxidizing agent accepts electrons and is reduced. Thus, its oxidation number decreases.

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