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| Column-$I$ Complex | Column-$II$ Structure / Geometry / Property |
|---|---|
| $A$. $[Ni(CN)_4]^{2-}$ | $I$. Tetrahedral / Paramagnetic |
| $B$. $[Ni(CO)_4]$ | $II$. Tetrahedral / Diamagnetic |
| $C$. $[NiCl_4]^{2-}$ | $III$. Square planar / Diamagnetic |
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