Question

Explain why [cu(nh3)4]^2+ ion is coloured while [cut(cn)4]^3- ion is colourless?

Answer 1

t
becuse in (cu,cn4) I n not singal electrone

Answer 2

Answer:

Explanation:

in [cu(nh3)4]^2+, Cu=> Cu^2+, so it has one unpaired electron. so in this case it may either be square planar or tetrahedral.. when nh3 is coming, the free electron in 3d orbital jumps to 4p orbital, and hence dsp2 hybridisation is formed. so it has square planar geometry. it can be observed as for Cu^2+ with coordination no. 4 , it will be square planar with one unpaired electron.

while in {Cu(CN)4]^3- , Cu=> Cu+, so it has no unpaired electron and hence do not impart colour