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On the basisof valence bondtheoryexplainthenatureof bondingin [CoF_(6)]^(3-) ion. |
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Answer» Solution :Thenatureofbondingin `[CoF_(6)]_("ions")^(3-)`: (1) Hexafluorcobalt(III) ions, `[CoF_(6)]^(3-)` is an an anioniccomplex , thestate of cobaltis +3 and thecoordinationnumnber is 6. (2) Electronicconfiguration : `""_(27)Co[Ar]^(18) 3d^(7)4s^(2) 4p^(0)4d^(0)` Electronicconfiguratin `:Co^(3+)[Ar]^(18) 3d^(6) 4s^(0) 4p^(0) 4d^(0)` `Co^(3+)` (Groundstate)  (3) Since`F^(-)` is a weakligand, there is nospin pairingeffect and`Co^(3+)`possesses 4 unpaired ELECTRONS. (4) Sincethe coordinationnumberis 6,the`Co^(3+)`ion getssix vacantorbitalsby hybridisationof one 4s orbitalsgivingoctahedral geometry.  (5)6 lonepairsof electrons FORM `6F^(-)`LIGANDS are accommodated in the sixvacant `sp^(3)d^(2)` hydrib oribitalsof `F^(-)`forming 6 coordinatebondsgivingoctahedral geometryto thecomplex. It isan outercomplex.  As the complexhas 4 unpariedelectrons it isparamagentic. |
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