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  • Among the statements (a) - (d), the incorrect ones are: (a) Octahedral Co(III) complexes with strong field ligands have very high magnetic moments. (b) When <img alt="\Delta _{0}<P" src="http://entrancecorner.oncodecogs.com/gif.latex?%5CDelta%2

Among the statements (a) - (d), the incorrect ones are: (a) Octahedral Co(III) complexes with strong field ligands have very high magnetic moments. (b) When \Delta _{0}<P, the d-electron configuration of Co(III) is an octahedral is t_{eg}^{4}e_{g}^{2}. (c) Wavelength of light absorbed by \left [ Co(en)_{3} \right ]^{3+} is lower than that of \left [ CoF_{6} \right ]^{3+} (d) If the \Delta _{0}  for an octahedral complex of Co(III) is 18,000 cm-1, the \Delta _{t} for tetrahedral complex with the same ligand will be 16,000cm-1
Option: 1 b and c only
Option: 2 a and b only
Option: 3 a and d only
Option: 4 c and d only
 

Answers (1)

best_answer

  • (a) Incorrect – Co(III) with strong field ligands forms low-spin complexes → few or no unpaired electrons → low magnetic moment, not high.

  • (b) Incorrect – Co(II) = 3d?. If Δ? < P → high spin → correct configuration is t_{2 g}^5 e_{g^{\prime}}^2 \operatorname{not} t_{2 g}^4 e_{g^{\prime}}^2

  • (c) Correct – [Co(en)?]3+ has strong field ligand → absorbs shorter wavelength light than [CoF?]3-

  • (d) Incorrect – Tetrahedral field splitting Δ? ≈ \(\frac{4}{9} \Delta_0 \rightarrow \frac{4}{9} \times 18,000=8,000 cm^{-1}\), not \(16,000 cm^{-1}\).

  • So, (a), (b), and (d) are incorrect → Correct option is: 3 (though it says a and d only, it should be a, b, and d)..

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Divya Sharma

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