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From the magnetic behaviour of [NiCl 4 ] 2– (paramagnetic) and [Ni(CO) 4 ] (diamagnetic), choose the correct geometry and oxidation state.

1. [NiCl 4 ] 2– : Ni II , square planar [Ni(CO) 4 ] : Ni(0), square planar
2. [NiCl 4 ] 2– : Ni II , tetrahedral [Ni(CO) 4 ] : Ni(0), tetrahedral
3. [NiCl 4 ] 2– : Ni II , tetrahedral [Ni(CO) 4 ] : Ni II , square planar
4. [NiCl 4 ] 2– : Ni(0), tetrahedral [Ni(CO) 4 ] : Ni(0), square planar

Correct answer: [NiCl 4 ] 2– : Ni II , tetrahedral [Ni(CO) 4 ] : Ni(0), tetrahedral

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