Question

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

• A. $Si{Cl}_4<Al{Cl}_3<CaCl<KCl$
• B. $KCl<Ca{Cl}_2<Al{Cl}_3<Si{Cl}_4$
• C. $Al{Cl}_3<Ca{Cl}_2<KCl<Si{Cl}_4$
• D. none of these

Answer 1

Answer: (B)

$KCl<Ca{Cl}_2<Al{Cl}_3<Si{Cl}_4$

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 $SiC{l}_4$ having more covalent character. Hence the order of increasing covalent character is:

$KCl<CaC{l}_2<AlC{l}_3<SiC{l}_4$

Option B is correct.