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  4. Primary and secondary valencies of Cu in [ Cu ( NH 3)4] SO 4 is

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Q. Primary and secondary valencies of $Cu$ in $\left[ Cu \left( NH _{3}\right)_{4}\right] SO _{4}$ is

Coordination Compounds

Solution:

${\left[ Cu \left( NH _{3}\right)_{4}\right] SO _{4} \Rightarrow \left[ Cu \left( NH _{3}\right)_{4}\right]^{2+}+ SO _{4}^{2-}}$
$\Rightarrow $ Primary valency $=2$
$Cu$ is bonded to $4, NH _{3}$ ligands.
$\Rightarrow $ Secondary valency $=4$