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Explain the structure of [CO(NH_(3))_(6)]^(3+)on thebasis of valencebond theory. |
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Answer» Solution :(1)Hexaamminecobalt (III) ion, `[CO(NH_(3))_(6)]^(3+)` is a cationiccomplex, theoxidationstate of cobalt is `+3`and thecoordinationnumberis 6 . (2) Electronicconfiguration `: ""_(27)Co[Ar]^(18) 3d^(7) 4s^(2)` Electronicconfiguration `Co^(3+)[Ar]^(18) 3d^(6)4s^(0)4p^(0)` `Co^(3+)1`(Ground state)  (3) Since `NH_(3)`is a strong ligand ,dueto spinpariringeffect, all thefour unpairedelectrons in 3d-orbital are paired givingtwo vacant3d-orbitals. `Co^(3+)` (Excited state)  (4) since the coordinationnumber is 6 `Co^(3+)`ion gets sixvacantorbitals by hybridisationof two 3d vacantorbitals , one4sand three 4p-orbitalsformingsix `d^(2) sp^(3)`hydridorbitalsgivingoctahedral geometry . It ISAN inner complex. `Co^(3+)`` (##NVT_21_CHE_XII_C13_E09_002_S03.png" width="80%"> (5) 6 lone pairsof electrons form `6NH_(3)`ligands are accommodated in the sixvacant`d^(2)sp^(3) ` hydrid orbitals. Thussixhydridorbitalsof `Co^(3+)` overlap withfille d orbitals of `NH_(3)`forming 6 coordinatebonds givingoctahedral geometry to thecomplex.  Sincethe complexhas all electronspaired , ITIS diamagentic .  .
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