Consider Two Complexes: (I) [Fe(CN)₆]^4-, and (II) [Fe(H₂O)₆]²⁺

question 81

Multiple Choice

Consider two complexes: (I) [Fe(CN) ₆]^4-, and (II) [Fe(H₂O) ₆]²⁺. In view of 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 low spin, II is high spin, and I absorbs light at the shorter wavelength.
• C) I is high spin, II is low spin, and I absorbs light at the shorter wavelength.
• D) Both have 6 d electrons, so both are high spin.
• E) Both have 6 d electrons, so both are low spin.

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