Which of the following substances has the lea | vedclass

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(D) According to Fajan's rule,the covalent character of an ionic bond is directly proportional to the polarizing power of the cation and the polar

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$BaCl_2$

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(D) According to Fajan's rule,the covalent character of an ionic bond is directly proportional to the polarizing power of the cation and the polarizability of the anion.The polarizing power of a cation increases as its size decreases and its charge increases.Comparing the cations in the given compounds: $N^{3+}$ (in $NCl_3$),$O^{2+}$ (in $Cl_2O$),$Pb^{2+}$ (in $PbCl_2$),and $Ba^{2+}$ (in $BaCl_2$).Among these,$Ba^{2+}$ has the largest ionic radius and the lowest charge density.Since $Ba^{2+}$ has the lowest polarizing power,$BaCl_2$ exhibits the least covalent character and the highest ionic character.

Which of the following substances has the least covalent character?

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