Question

Explain $\left[Co\right(N{H}_3{)}_6{]}^{3+}$ is an inner orbital complex whereas $\left[Ni\right(N{H}_3{)}_6{]}^{2+}$ is an outer orbital complex.

Answer 1

$\left[CO\right(N{H}_3{)}_6{]}^{3+}$ is inner orbital complex

$CO\to \left[Ar\right]3d^{7}4s^2$

$C{O}^{+3}\to \left[Ar\right]3d^{6}4s^0$

With $+3$ oxidation state $N{H}_3$ act as a strong ligand.