Assertion : [Al(H_2O)_6]^{3+} is a stronger a | vedclass

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(A) The acidity of metal complexes depends on the charge-to-size ratio (ionic potential) of the central metal ion. $Al^{3+}$ has a higher charge $(+3)

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If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

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(A) The acidity of metal complexes depends on the charge-to-size ratio (ionic potential) of the central metal ion. $Al^{3+}$ has a higher charge $(+3)$ and a smaller ionic radius compared to $Mg^{2+}$ $(+2)$. This results in a higher charge density for $Al^{3+}$,which polarizes the $O-H$ bond in the coordinated water molecules more effectively,facilitating the release of $H^+$ ions. Therefore,$[Al(H_2O)_6]^{3+}$ is a stronger acid than $[Mg(H_2O)_6]^{2+}$. Both the Assertion and the Reason are correct,and the Reason correctly explains the Assertion.

Assertion : $[Al(H_2O)_6]^{3+}$ is a stronger acid than $[Mg(H_2O)_6]^{2+}$.
Reason : Size of $[Al(H_2O)_6]^{3+}$ is smaller than $[Mg(H_2O)_6]^{2+}$ and possesses more effective nuclear charge.

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Assertion : $[Al(H_2O)_6]^{3+}$ is a stronger acid than $[Mg(H_2O)_6]^{2+}$.Reason : Size of $[Al(H_2O)_6]^{3+}$ is smaller than $[Mg(H_2O)_6]^{2+}$ and possesses more effective nuclear charge.