Which of the following complexes exhibits square planar geometry?

Using valence bond theory,explain the following in relation to the complexes given below: $[Mn(CN)_{6}]^{3-}, [Co(NH_{3})_{6}]^{3+}, [Cr(H_{2}O)_{6}]^{3+}, [FeCl_{6}]^{4-}$
$(i)$ Type of hybridisation.
$(ii)$ Inner or outer orbital complex.
$(iii)$ Magnetic behaviour.
$(iv)$ Spin only magnetic moment value.

Which one of the following is wrongly matched?

Generally,$FeCl_3 \cdot 6H_2O$ is represented as:

What is the shape of $Fe(CO)_5$?

How many electrons are present in the $3d$ orbital of the tetrahedral $K_2[NiCl_4]$ complex?