Assertion :Fullerences ar the only pure form of carbon.
Reason: It contains twenty, five membered rings and twelve, six- membered rings.

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
According to latest discoveries Fullerenes are the purest form of Carbon.Because they do not have surface bonds that to be attracted by other atoms as we see in the case of diamond and graphite.
Fullerenes are the pure carbons that are in form of spherical hollow cage like soccer ball with 60 carbon atoms.It has twenty, five membered rings and twelve ,six membered rings.
Hence both Assertion and Reason are correct but Reason is not correct explanation for Assertion.

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