Chemistry - Coordination Chemistry Question with Solution | TestHub
ChemistryCoordination ChemistryVBT,CFT(complex compound)Hard2 minQB
ChemistryHardnumerical
The mixed-valence salt Fe₄[Fe(CN)₆]₃ (schematic below) has four outer Fe³⁺ ions in a weak field (high spin) and three inner Fe²⁺ ions in [Fe(CN)₆]⁴⁻. Let x be the average number of unpaired electrons per iron ion, y the total number of 3d orbitals used in hybridisation in one formula unit, and z the average oxidation number of iron. Find x + y + z to two decimal places.
Answer:
11.43
Solution:
Unpaired electrons: outer Fe³⁺ has 5 each, inner low-spin Fe²⁺ has 0, so x = (4 × 5 + 3 × 0)/7 = 20/7. Each inner d²sp³ complex uses 2 d orbitals, so y = 3 × 2 = 6. z = (4 × 3 + 3 × 2)/7 = 18/7. x + y + z = 20/7 + 6 + 18/7 = 11.43.
Stream:JEESubject:ChemistryTopic:Coordination ChemistrySubtopic:VBT,CFT(complex compound)
⏱ 2mℹ️ Source: QB
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