Chemistry - Coordination Chemistry Question with Solution | TestHub
Different theories like electrostatic theory (developed by Kossel, Magnus, Van Arekel, Garrick), Sidgwick's effective atomic number rule (EAN), Pauling's valence bond theory (VBT), crystal field theory (CFT), adjusted crystal field theory (ACFT) or ligand field theory (LFT) providing some allowance of covalence in CFT, and molecular orbital theory (MOT) have been proposed for understanding of bonding in coordination compounds.
Calculate the value of : Here
Among the species given below, the total number of diamagnetic species is . MnCl₄²⁻, NO₂ monomer, O₂⁻ (superoxide), CoCl₄²⁻, Mn₃O₄, (NH₄)₂[FeCl₄], CuCl₄²⁻, K₂MnO₄, K₂CrO₄
The total number of complexes which follow Sidgwick's EAN rule is . (Atomic number: Mo = 42, Pt = 78, Ag = 47) [Mo(σ–C₃H₅)Br(NH₃)₂], [Fe(η⁵–C₅H₅)₂], [Ni(DMG)₂], [Mn₂(CO)₁₀], [Fe(CO)₂(NO)₂]⁰, [PtCl₃(η²–C₂H₄)]⁻, [Ag(CN)₂]⁻¹, [Fe₂(CO)₉]⁰
Answer:
Solution:
Finding (Diamagnetic species): Only K₂CrO₄ is diamagnetic because Cr⁶⁺ has a configuration with zero unpaired electrons, while all other listed species contain unpaired electrons (paramagnetic). Thus, .
Finding (Follows EAN rule): The complexes that achieve a noble gas configuration () are , , , and . Thus, .
Final Calculation:
