Question

Which one of the following complexes is an outer orbital complex? (Atomic numbers $Mn=25,Fe=26,Co=27,Ni=28$ )

• A. ${\left[Fe(CN{)}_6\right]}^{4-}$
• B. ${\left[Mn(CN{)}_6\right]}^{4-}$
• C. ${\left[Co{\left(N{H}_3\right)}_6\right]}^{3+}$
• D. ${\left[Ni{\left(N{H}_3\right)}_6\right]}^{2+}$

Answer 1

Answer: (D)

Solution The complex in which nd orbitals are used in hybridisation, are called outer orbital complex.
(a) ${\left[Fe(CN{)}_6\right]}^{4-}=$

(b) ${\left[Mn(CN{)}_6\right]}^{4-}=$

(c) ${\left[Co{\left(N{H}_3\right)}_6\right]}^{3+}=$

(d) ${\left[Ni{\left(N{H}_3\right)}_6\right]}^{2+}=$