Question

When the excess of ammonia is added to the copper sulphate solution, the deep blue coloured complex is formed. The complex is_________.

• A. tetrahedral and paramagnetic
• B. tetrahedral and diamagnetic
• C. square planar and diamagnetic
• D. square planar and paramagnetic.

Answer 1

The correct option is D square planar and paramagnetic.

$CuS{O}_4+\underset{Excess}{\underset{}{N{H}_3}}\Rightarrow \underset{DeepblueSolution}{\underset{}{\left[Cu\right(N{H}_3{)}_4{]}^{2+}}}$

$C{u}^{2+}\Rightarrow \left[Ar\right]3d^9$

1. Paramagnetic.

2. $ds{p}^2$ ybridisation.

3. It has $ds{p}^2$ hybridisation so that complex has square planar geometry.