MHT CET20249 May 2024Morning ShiftChemistryCoordination CompoundsActual
Which from the following statements about [ Co ( NH ₃ )₆ ]³⁺ complex is NOT correct?
Options
- APrior to hybridization Co ³⁺ possesses four unpaired electrons.
- BThis complex has all electrons'paired.
- CIt is a high spin complex.
- DIt is a diamagnetic complex.
Correct answer
C. It is a high spin complex.
Step-by-step solution
In [ Co ( NH ₃ )₆ ]³⁺ , oxidation state of cobalt is +3 . Valence shell electronic configuration of Co ³⁺ is represented in box diagram as shown: Thus, prior to hybridisation, Co ³⁺ possesses 4 unpaired electrons. Complex is low spin, so pairing of electrons will take place and electronic configuration after pairing would be Six orbitals available for hybridisation are two 3 d , one 4 s , three 4 p orbitals As all electrons are paired, the complex is diamagnetic.