Thank you for reporting, we will resolve it shortly
Q.
When excess of $KCN$ is added to aqueous solution of copper sulphate a co-ordination compound $K _{ x }\left[ Cu ( CN )_{4}\right]$ is formed. The value of $x$ is
Coordination Compounds
Solution:
$2 KCN + CuSO _{4} \longrightarrow Cu ( CN )_{2}+ K _{2} SO _{4}$
$\underset{\text{(unstable)}}{2 Cu ( CN )_{2}} \longrightarrow Cu _{2}( CN )_{2}+( CN )_{2}$
$Cu _{2}( CN )_{2}+6 KCN \longrightarrow 2 K _{3}\left[ Cu ( CN )_{4}\right]$