Amongst $Ni(C{l}_4{)}^{2-},{\left[Ni{\left(H_{2}O\right)}_6\right]}^{2+}$,$\left[Ni{\left(P{Ph}_3\right)}_2{Cl}_2\right]$,$\left[Ni{\left(CO\right)}_4\right]$ and ${\left[Ni{\left(CN\right)}_4\right]}^{2-}$, the paramagnetic species are:

Q.

Amongst $Ni(CO{)}_4,[Ni(CN{)}_4{]}^{2-}andNiC{l}_4^{2-}:$

Q. Amongst $Ni(CO{)}_4$, $\left[Ni\right(CN{)}_4{]}^{2-}$ and $NiC{l}_4^{2-}$:

Q. Among $Ni(CO{)}_4,[Ni\left(CN{)}_4{]}^{2-}and\right[NiC{l}_4^{2-}]$
[IIT-JEE, 1991]

Q. Among $Ni{\left(CO\right)}_4$ and ${\left[Ni{\left(CN\right)}_4\right]}^{2-}$ and $Ni{Cl}_4^{2-}$?

Q. Amongst $[NiC{l}_4{]}^{2-},[Ni(H_{2}O{)}_6{]}^{2+},[Ni\left(PP{h}_3{)}_{2}C{l}_2\right],\left[Ni\right(CO{)}_4]$ and $\left[Ni\right(CN{)}_4{]}^{2-}$, the paramagnetic species are :