Colour of cobalt(II) complexes: pink [Co(H2O)6]2+ and blue [CoCl4]2-

1. A.
   presence of unpaired electrons
2. B.
   charge transfer
3. C.
   nature of ligands attached to the metal ion
4. D.
   change in geometry of new complex formed

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1. A.
   The formation of $\mathrm{[Co(H_2O)_6]^{2+}}$ complex that has octahedral geometry.
2. B.
   The formation of $\mathrm{[Co(H_2O)_6]^{2+}}$ complex that has tetrahedral geometry.
3. C.
   The formation of $\mathrm{[Co(H_2O)_6]^{2-}}$ complex that has tetrahedral geometry.
4. D.
   The formation of $\mathrm{[Co(H_3O)_6]^{2+}}$ complex that has octahedral geometry.

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