What type of hybridization is found in $[Ni(Cl)_4]^{2-}$?

Which of the following cobalt-$(III)$ complex is paramagnetic and high spin complex?

Which of the following pairs of structure and magnetic properties is correct for the tetracyanonickelate$(II)$ ion?

For octahedral $Mn(II)$ and tetrahedral $Ni(II)$ complexes,consider the following statements:
$(I)$ Both the complexes can be high spin.
$(II)$ $Ni(II)$ complex can very rarely be low spin.
$(III)$ With strong field ligands,$Mn(II)$ complexes can be low spin.
$(IV)$ Aqueous solution of $Mn(II)$ ions is yellow in color.

Which complex compound possesses $sp^3d^2$ hybridisation?

The geometries of $[Ni(CO)_4]$,$[PtCl_4]^{2-}$ and $[Co(NH_3)_6]^{3+}$ respectively are