Assertion :Magnetic moment of $M n^{2 +}$ is less than that of $C r^{2 +}$ . Reason: Higher the atomic number smaller is the magnetic moment.

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 D Both Assertion and Reason are incorrect
$M n^{+ 2}$ has $5$ unpaired electrons and $C r^{+ 2}$ has $4$ unpaired electrons,so magnetic moment of $M n^{+ 2}$ is surely greater than that of $C r^{+ 2}$ . Also magnetic moment depends on the number of unpaired electrons but not on atomic number.

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