Answer:
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.
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