The complexes of Ni are listed below I. $[\mathrm{Ni(CO)_4}]$ II. $[\mathrm{Ni(CN)_4}]^{2-}$ III. $[\mathrm{NiCl_4}]^{2-}$ Which of the following statements is true about the above complexes?
- AAll of them have tetrahedral geometry.
- BI and III are tetrahedral and II has square planar geometry.
- CI and II are tetrahedral and III is square planar.
- DAll of them have square planar geometry.
✓ Correct answer: B
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