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Coordination Compounds
Crystal Field Theory and Magnetic Behaviour of Complexes
1 question from 1 paper, each with its answer.
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Concepts tested
- Strong field vs weak field ligands and magnetism of Co complexes
All Questions
2024 1 question
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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:$[Co(NH_3)_6]^{3+}$ and $[CoF_6]^{3-}$ are both octahedral. In $[Co(NH_3)_6]^{3+}$ ($NH_3$ is a strong field ligand), all electrons are paired ($t_{2g}^6e_g^0$), so it is diamagnetic. In $[CoF_6]^{3-}$ ($F^-$ is a weak field ligand), there are four unpaired electrons ($t_{2g}^4e_g^2$), so it is paramagnetic. So they differ in magnetic behaviour: both Statement I and Statement II are true.