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How many of the following complexes have the central metal ion in the t2g⁶ eg⁰ electronic configuration? (I) [Co(NH3)5Cl]Cl2 (II) (NH4)2[PtCl4] (III) K4[Ni(CN)6] (IV) K3[Co(NO2)6] (V) K3[Fe(CN)6] (VI) Na2[Fe(CN)5(NO)]
- 1
- 2
- 3
- 4
Correct answer: 3
Solution
Co³+ in complexes I and IV is d⁶ low-spin (t2g⁶ eg⁰). Fe²+ in complex VI is d⁶ low-spin with CN⁻ and NO. Complex III has Ni⁰ which is d¹⁰, V has Fe³+ (d⁵), II has Pt²+ (d⁸ square planar). So 3 complexes qualify.
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