The combination of which of the following giv | vedclass

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(A) According to Fajan's rule,the covalent character in an ionic compound increases with a smaller size of the cation and a larger size of the anion.C

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$Mg^{2+}$ and $Cl^{-}$

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(A) According to Fajan's rule,the covalent character in an ionic compound increases with a smaller size of the cation and a larger size of the anion.Comparing the cations: $Mg^{2+}$ is smaller than $Na^{+}$ due to higher charge density.Comparing the anions: $O^{2-}$ is smaller than $Cl^{-}$ and $Br^{-}$. However,the polarizing power of $Mg^{2+}$ is significantly higher than $Na^{+}$.Among the given options,$Mg^{2+}$ and $Cl^{-}$ provides a combination where the cation has high charge and the anion is relatively large and polarizable,leading to significant covalent character. Specifically,$MgCl_2$ is more covalent than $NaCl$ or $MgO$ due to the balance of cation size and anion polarizability.

The combination of which of the following gives an ionic compound with maximum covalent character?

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