Write down correct order of covalent character of the following.
a . LiCl , NaCl , RbCl , KCl
b. NaCl , Mg $C l_{2}$ , Si $C l_{4}$
c . Sn $C l_{2}$ , Sn $C l 4$

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Solution

In an ionic compound, the ability of cation to attract the electrons of anion is called the polarizing power. Due to polarizability of anion, it gets distorted & sharing of electrons take place and ionic compounds possess some covalent character.
Greater is the polarization , greater is the covalent character.
$∴$ Decreasing order of covalent character is
(1) $L i C l > N a C l > K C l > R b C l$
Since smaller the cation , more is the covalent character.
(2) $S i C l_{4} > M g C l_{2} > N a C l$
Since cation has more positive charge & is more covalent.
(3) $S n C l_{4} > S n C l_{2}$
Since oxidation state of $S n$ is $+ 4$ & $+ 2$ i.e. more positive charge, more covalent.

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