Which of the following statements are correct with respect to ${\left[NiC{l}_4\right]}^{2-}\text{ and }\left[Ni{\left(PP{h}_3\right)}_{2}C{l}_2\right]$? 

$C{l}^{-}$ is weak ligand so no pairing of electrons take place. so ${\left[NiC{l}_4\right]}^{-2}$ is tetrahedral. ${\text{pph}}_3$ group is bulkier one so it favours tetrahedral geometry, through ${\text{pph}}_3$ is strong field ligand.