The spin only magnetic moment of $[MnBr_{4}]^{2-}$ is $5.9 \ BM$. The geometry of this complex ion is

Write the limitations of Valence Bond Theory $(VBT)$.

Which of the following complexes exhibits $sp^{3}d$ hybridization?

Given below are two statements :
Statement $I$: $[Ni(CN)_4]^{2-}$ is square planar and diamagnetic complex with $dsp^2$ hybridization for $Ni$ but $[Ni(CO)_4]$ is tetrahedral,diamagnetic and with $sp^3$ hybridization for $Ni$.
Statement $II$: $[NiCl_4]^{2-}$ and $[Ni(CO)_4]$ both have same $d$-electron configuration,have same geometry and are paramagnetic.
In light of the above statements,choose the correct answer from the options given below:

What is the magnetic moment (spin only) and hybridisation of the brown ring complex $[Fe(H_2O)_5NO]SO_4$?

Which one of the following complexes is an outer orbital complex?