Assertion :The atoms or ions possessing unpaired electrons are paramagnetic in nature whereas those possessing electron pairs are diamagnetic in nature. Reason: In diamagnetic substances, the spins of the two electrons cancel out and thus the diamagnetic substances doesnot show any magnetic behaviour . However in paramagnetic substances, the spin of the electron counts and the resultant magnetic moment is not zero.

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
An electron is designated with a spin as $+ 1 / 2$ or $- 1 / 2$ . In diamagnetic substances, the spins of the two electrons cancel out and thus the diamagnetic substances doesnot show any magnetic behaviour . However in paramagnetic substances, the spin of the electron counts and the resultant magnetic moment is not zero.

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