Assertion : $L i$ resembles with $M g$ in properties. Reason: $L i^{+}$ has almost same polarising power as $M g^{2 +}$ .

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
$L i$ (alkali metals) belongs to first group and $M g$ (alkaline earth metal) belongs to second group and they are diagonally related. This is because they both have almost same radii.
Due to this relation, $L i$ resembles with $M g$ in properties as they both have same electron density and $L i^{+}$ has almost same polarising power as $M g^{2 +}$ .

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