Which of the following orders is incorrect?

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(A) According to Fajan's rule, the covalent character of an ionic compound increases with an increase in the polarizing power of the cation and the po

Vedclass · Accepted Answer

Ionic character $\Rightarrow MCl > MCl_2 > MCl_3$

Vedclass · Answer

(A) According to Fajan's rule, the covalent character of an ionic compound increases with an increase in the polarizing power of the cation and the polarizability of the anion.$1$. Ionic character: As the oxidation state of the metal increases, the covalent character increases, so the ionic character decreases. Thus, $MCl > MCl_2 > MCl_3$ is correct.$2$. Polarizability: As the size of the anion increases, the electron cloud becomes more loosely held and more easily distorted. Thus, $F^{-} $3$. Polarizing power: Polarizing power is directly proportional to charge density $(charge/size)$. $Ca^{2+}$ $(r = 99 	ext{ pm})$, $Mg^{2+}$ $(r = 72 	ext{ pm})$, $Al^{3+}$ $(r = 54 	ext{ pm})$. The charge-to-size ratio increases as $Ca^{2+} $4$. Covalent character: According to Fajan's rule, as the size of the anion increases, the covalent character increases. For the same cation $(Li^{+})$, the order of covalent character is $LiF Wait, re-evaluating the options: All provided options are scientifically correct. However, if this is a multiple-choice question where one must be incorrect, there might be a typo in the question or options provided. Given the standard chemistry principles, all listed trends are correct.

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