Assertion :Divalent compounds of alkaline earth metals are diamagnetic. Reason: $M^{2 +}$ ions of group 2 have noble gas conguration.

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
Species with no lone pair of electrons behave as diamagnetic. Divalent compounds of alkaline earth metals are diamagnetic. As $M^{2 +}$ ions of group 2 have a noble gas configuration. That is no lone pair of electrons. All the electrons are paired. So, both Assertion and Reason are correct and Reason is the correct explanation for Assertion. Hence, option A is correct.

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