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(B) According to Fajan's rule,the covalent character in an ionic bond is determined by the following factors:$1$. Polarising power of the cation $(a)$

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$3$

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(B) According to Fajan's rule,the covalent character in an ionic bond is determined by the following factors:$1$. Polarising power of the cation $(a)$.$2$. Polarisability of the anion $(c)$.$3$. The extent of distortion of the anion $(b)$,which is a direct consequence of the first two factors.Factor $(d)$,the polarising power of the anion,is generally negligible as anions are typically large and have low charge density compared to cations.Therefore,there are $3$ factors ($a$,$b$,and $c$) that affect the covalent character.

The number of the following factors which affect the percent covalent character of the ionic bond is $............$.
$(a)$ Polarising power of cation
$(b)$ Extent of distortion of anion
$(c)$ Polarisability of the anion
$(d)$ Polarising power of anion

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The number of the following factors which affect the percent covalent character of the ionic bond is $............$.$(a)$ Polarising power of cation$(b)$ Extent of distortion of anion$(c)$ Polarisability of the anion$(d)$ Polarising power of anion