Which of the following order is incorrect?

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Question

(A) According to $Fajan's$ rule,the covalent character of an ionic compound increases as the polarising power of the cation increases or the polarizab

Vedclass · Accepted Answer

Ionic character $	o MCl > MCl_2 > MCl_3$

Vedclass · Answer

(A) According to $Fajan's$ rule,the covalent character of an ionic compound increases as the polarising power of the cation increases or the polarizability of the anion increases.$1$. Ionic character is inversely proportional to covalent character. As the oxidation state of the metal increases $(MCl  MCl_2 > MCl_3$ is correct.$2$. Polarizability of anions increases with size: $F^{-} $3$. Polarising power of cations increases with charge density (charge/size ratio): $Na^{+} (1/r) $4$. Covalent character increases as the size of the anion increases for a fixed cation $(Li^{+})$. The order should be $LiF Wait,re-evaluating option $C$: The charge density of $Ca^{2+}$ is lower than $Mg^{2+}$ because $Ca^{2+}$ has a larger ionic radius. So $Na^{+} < Ca^{2+} < Mg^{2+} < Al^{3+}$ is correct. All options appear correct based on standard chemical principles. However,if we re-examine the options provided in typical textbooks for this specific question,often the intended incorrect order is related to the comparison of $Ca^{2+}$ and $Mg^{2+}$. Given the standard set,all are technically correct. If forced to choose,check for typos in the source.

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