Question

Which one 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–

Answer 1

Answer: (A)

$Ni(NH3)6$2+

Answer 2

[Ni(NH3)6]2+ has sp3d2 hybridisation having octahedral geometry as with d8 configuration no two empty d-orbitals are available for d2sp3 hybridisation. As sp3d2 hybridisation involves nd orbital (i.e. outer orbitals), so the complex is called as outer orbital complex.