Assertion : $N O$ is diamagnetic in solid or liquid state but paramagnetic in gaseous state. Reason: $N O$ contains one unpaired electron.

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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Assertion is incorrect but Reason is correct

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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
$N O$ has an odd number of electrons (11 valence electrons) and hence is paramagnetic in the gaseous state.

But in liquid and solid states, it exists as a symmetrical or asymmetrical dimer in which unpaired electrons gets paired up and hence is diamagnetic in these states.

Hence, option (B) is correct.

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