Assertion (A): The energy required to form $M g^{+ 2}$ from $M g$ is much higher than that required to form $M g^{+}$ from $M g$
Reason (R): $M g^{+ 2}$ is small ion and carry more charge than $M g^{+}$

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Both A and R true, but R is not the correct explanation of A

A is false but R is true

Both A and R are true and R is the correct explanation of A.

A is true but R is false

answer is D.

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Detailed Solution

$M g \overset{I E_{1}}{\to} M g^{+} \overset{I E_{2}}{\to} M g^{+ 2}$

$I E_{2}$ is higher than of $I E_{1}$ .
Due to small size of $M g^{+ 2}$ and more effective nuclear charge than $M g^{+}$

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