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ChemistryNEET 2024Valence bond and crystal field theory

Coordination Compounds

Given below are two statements:

Statement I: Both [Co(NH3)6]3+\mathrm{[Co(NH_3)_6]^{3+}} and [CoF6]3−\mathrm{[CoF_6]^{3-}} complexes are octahedral but differ in their magnetic behaviour.

Statement II: [Co(NH3)6]3+\mathrm{[Co(NH_3)_6]^{3+}} is diamagnetic whereas [CoF6]3−\mathrm{[CoF_6]^{3-}} is paramagnetic.

In the light of the above statements, choose the correct answer from the options given below:

  1. A.Both Statement I and Statement II are false
  2. B.Statement I is true but Statement II is false
  3. C.Statement I is false but Statement II is true
  4. D.Both Statement I and Statement II are true✓

Solution

Both are octahedral Co3+\mathrm{Co^{3+}} (d6d^6) complexes. NH3\mathrm{NH_3} is a strong-field ligand, giving low-spin t2g6t_{2g}^6 — diamagnetic. F−\mathrm{F^-} is weak-field, giving high-spin with four unpaired electrons — paramagnetic. Both statements are true.

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