Consider Two Complex Ions: (I) [Co(CN)₆]^3-, and (II) [CoCl₆]^3-

question 39

Multiple Choice

Consider two complex ions: (I) [Co(CN) ₆]^3-, and (II) [CoCl₆]^3-. In view of the ordering of ligands in the spectrochemical series, which one of the following sets of predictions is most likely correct?
Spectrochemical Series
I^- < Br ^- < Cl^- < F^- < OH^- < H₂O < NH₃ < NO₂^- < CN^- < CO

• A) I is low spin, II is high spin, and II absorbs light at the shorter wavelength.
• B) I is high spin, II is low spin, and I absorbs light at the shorter wavelength.
• C) Both are low spin.
• D) I is high spin, II is low spin, and II absorbs light at the shorter wavelength.
• E) I is low spin, II is high spin, and I absorbs light at the shorter wavelength.

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