In the extraction of silver,zinc metal is used as a reducing agent. What is the molecular structure of the zinc complex formed in this reaction?

The hybridisation involved in $[CoF_6]^{3-}$ is :

Dimethyl glyoxime forms a square planar complex with $Ni^{2+}$. This complex should be

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.

Predict the number of unpaired electrons in the square planar $[Pt(CN)_{4}]^{2-}$ ion.

The structure of $K[PtCl_3(C_2H_4)]$ and hybridization of $Pt$ respectively are: