Question

Which of the following is more covalent among the following and why?

1)CuO and CuS

2)AgCl and Agl

3)$Pbc{l}_{2}andpbC{l}_4$

4)NaCl and CuCl

Answer 1

This is explained with the help of Fazan's rules

(a) CuS is more covalent than CuO because $S_2^{-}$ ion is more polarised than the $O_2^{-}$ ion due to bigger size.

(b) $AgI$ is more covalent than $AgCl$ because $I^{-}$ ion is more polarised than $C{l}^{-}$ ion due to bigger size.

(c) $PbC{l}_4$ is more covalent than $PbC{l}_2$ because $P{b}_4^{+}$ ion due to smaller size and greater magnitude of positive charge is more polarising than $P{b}_2^{+}$ion.

(d)$BeC{l}_2$ is more covalent than $MgC{l}_2$ because the $B{e}^{2+}$ ion is more polarising than $M{g}^{2+}$ ion due to smaller size.