Assertion :When a magnet is dipped in a jar of liquid $O_{2}$ , some $O_{2}$ clings to it. Reason: According to M.O.T, $O_{2}$ is paramagnetic in nature.

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
According to molecular orbital theory, oxygen is paramagnetic in nature due to the presence of unpaired electrons. Paramagnetic substances are attracted by a magnetic field.
Hence, when a magnet is dipped in a jar of liquid oxygen, some oxygen clings to it.
Thus, both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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