Magnetic nature of Ni(CO)4 and [NiCl4]2- (with [Ni(CN)4]2-): which are diamagnetic or paramagnetic

1. A.
   $\left\lbrack Ni(CO)_{4} \right\rbrack$ and $\left\lbrack {NiCl}_{4} \right\rbrack^{2 -}$ both diamagnetic
2. B.
   $\left\lbrack Ni(CO)_{4} \right\rbrack$ and $\left\lbrack {NiCl}_{4} \right\rbrack^{2 -}$ both paramagnetic
3. C.
   $\left\lbrack {NiCl}_{4} \right\rbrack^{2 -}$ diamagnetic, $\left\lbrack Ni(CO)_{4} \right\rbrack$ paramagnetic
4. D.
   $\left\lbrack Ni(CO)_{4} \right\rbrack$ diamagnetic, $\left\lbrack {NiCl}_{4} \right\rbrack^{2 -}$ paramagnetic

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1. A.
   $\left\lbrack Ni(CN)_{4} \right\rbrack^{2 -}$ and $\left\lbrack {NiCl}_{4} \right\rbrack^{2 -}$ are diamagnetic and $Ni(CO)_{4}$ is paramagnetic.
2. B.
   $Ni(CO)_{4}$ and $\left\lbrack {NiCl}_{4} \right\rbrack^{2}$ are diamagnetic and $\left\lbrack Ni(CN)_{4} \right\rbrack^{2}$ is paramagnetic.
3. C.
   $Ni(CO)_{4}$ and $\left\lbrack Ni(CN)_{4} \right\rbrack^{2 -}$ are diamagnetic and $\left\lbrack {NiCl}_{4} \right\rbrack^{2 -}$ is paramagnetic.
4. D.
   $Ni(CO)_{4}$ is diamagnetic and $\left\lbrack {NiCl}_{4} \right\rbrack^{2 -}$ and $\left\lbrack Ni(CN)_{4} \right\rbrack^{2 -}$ are paramagnetic.

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