NEET2024ChemistryCoordination CompoundsActual
Given below are two statements : Statement I: Both [ Co ( NH ₃ )₆ ]³⁺ and [ CoF ₆ ]³⁻ complexes are octahedral but differ in their magnetic behaviour. Statement II: [ Co ( NH ₃ )₆ ]³⁺ is diamagnetic whereas [ CoF ₆ ]³⁻ is paramagnetic. In the light of the above statements, choose the correct answer from the options given below:
Options
- ABoth Statement I and Statement II are false
- BStatement I is true but Statement II is false
- CStatement I is false but Statement II is true
- DBoth Statement I and Statement II are true
Correct answer
D. Both Statement I and Statement II are true
Step-by-step solution
In [ Co ( NH ₃ )₆ ]³⁺, Co ³⁺ ion is having 3 ~d ^6 configuration. Electronic configuration of Co ³⁺ : In presence of NH ₃ ligand, pairing of electrons takes place and it becomes diamagnetic complex ion. In presence of NH ₃ ligand : [ Co ( NH ₃ )₆ ]³⁺ is octahedral with d ^2 sp ^3 hybridisation and it is diamagnetic in nature. In case of [ CoF ₆ ]³⁻ , Co is in +3 oxidation state and it is having 3 ~d ^6 configuration. In presence of weak field F ⁻ ligand, pairing does not take place. In presence of F ⁻ ligands : In