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Which one of the following complexes is an outer orbital complex?
  • a)
    [Ni(NH3)6]2+
  • b)
    [Mn(CN)6]4−
  • c)
    [CO(NH3)6]3+
  • d)
    [Fe(CN)6]4−
Correct answer is option 'A'. Can you explain this answer?
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Which one of the following complexes is an outer orbital complex?a)[Ni...
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Which one of the following complexes is an outer orbital complex?a)[Ni...
The correct answer is b) [Mn(CN)6]4-.

An outer orbital complex is a complex in which the metal-ligand bonds are formed by the overlap of the metal d orbitals with the ligand p orbitals. In [Mn(CN)6]4-, the ligands are cyanide (CN-) ions, which are strong field ligands that cause the d orbitals of the metal to split into two sets of three. The bonding orbitals formed between the metal and the ligands involve both the metal d orbitals and the ligand p orbitals. This type of bonding is characteristic of outer orbital complexes.

In [Ni(NH3)6]2+, the ligands are ammonia (NH3) molecules, which are weak field ligands that do not cause significant splitting of the d orbitals. The bonding in this complex is primarily through the overlap of the metal d orbitals with the ligand lone pairs, which is characteristic of inner orbital complexes.
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Which one of the following complexes is an outer orbital complex?a)[Ni(NH3)6]2+b)[Mn(CN)6]4−c)[CO(NH3)6]3+d)[Fe(CN)6]4−Correct answer is option 'A'. Can you explain this answer?
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