Q. Which one of the following complex is an outer orbital complex? (Atomic no. Mn=25, Fe=24, Co=27, Ni=28)
A) $\left\lbrack Fe(CN)_{6} \right\rbrack^{4 -}$
B) $\left\lbrack Mn(CN)_{6} \right\rbrack^{4 -}$
C) $\left\lbrack Co\left( {NH}_{3} \right)_{6} \right\rbrack^{3 +}$
D) $\left\lbrack Ni\left( {NH}_{3} \right)_{6} \right\rbrack^{2 +}$
Explanation
(d)
The complex in which nd orbitals are used in hybridisation, are called outer orbital complex.
$\left\lbrack Fe(CN)_{6} \right\rbrack^{4 -} =$
[image:9_image198.emf]
$\left\lbrack Mn(CN)_{6} \right\rbrack^{4 -} =$
[image:9_image199.emf]
$\left\lbrack Co\left( {NH}_{3} \right)_{6} \right\rbrack^{3 +} =$
[image:9_image200.emf]
$\left\lbrack Ni\left( {NH}_{3} \right)_{6} \right\rbrack^{2 +} =$
[image:9_image201.emf]
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.