The correct order of increasing covalent character of the following is:

S i {C l}_{4} < A l {C l}_{3} < C a C l < K C l

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K C l < C a {C l}_{2} < A l {C l}_{3} < S i {C l}_{4}

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A l {C l}_{3} < C a {C l}_{2} < K C l < S i {C l}_{4}

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none of these

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Solution

The correct option is D $K C l < C a {C l}_{2} < A l {C l}_{3} < S i {C l}_{4}$
The covalent character of the ionic compound can be determined by Fajans rules, the cation with a higher positive charge has a greater covalent character than the cation with a lower positive charge. In this $S i C l_{4}$ having more covalent character. Hence the order of increasing covalent character is:
$K C l < C a C l_{2} < A l C l_{3} < S i C l_{4}$
Option B is correct.

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