Which of the following compounds is the most | vedclass

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(B) According to Fajan's rule,the covalent character of an ionic bond increases with an increase in the size of the anion and a decrease in the size o

Vedclass · Accepted Answer

$AlI_3$

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(B) According to Fajan's rule,the covalent character of an ionic bond increases with an increase in the size of the anion and a decrease in the size of the cation. In the given compounds,$Al^{3+}$ is the smallest cation,which has the highest polarizing power. Among the anions ($Cl^{-}$ and $I^{-}$),the iodide ion $(I^{-})$ is larger than the chloride ion $(Cl^{-})$. Therefore,$AlI_3$ has the maximum polarization of the anion electron cloud by the cation,resulting in the highest covalent character.

Which of the following compounds is the most covalent?

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