In the $Cu$-ammonia complex,the state of hybridization of $Cu^{2+}$ is:

The complex ion $[Cu(NH_3)_4]^{2+}$ is:

For which of the following $d^n$ configurations of octahedral complexes,can they $NOT$ exist in both high spin and low spin forms?
$(I)$ $d^3$,$(II)$ $d^5$,$(III)$ $d^6$,$(IV)$ $d^8$

Which of the following is not a square planar complex?

The magnetic moment of $[MnCl_{4}]^{2-}$ is $5.92 \ BM$. Explain the reason for this value.

What type of hybridization is involved in $[Fe(CN)_6]^{3-}$?