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. $\left[M n(C N)_{6}\right]^{4-}$
• C. $\left[ Co \left(N H_{3}\right)_{6}\right]^{3+}$
• D. $\left[N i\left(N H_{3}\right)_{6}\right]^{2+}$

Answer 1

Answer: (D)

Solution The complex in which nd orbitals are used in hybridisation, are called outer orbital complex.
(a) $\left[F e(C N)_{6}\right]^{4-}=$

(b) $\left[M n(C N)_{6}\right]^{4-}=$

(c) $\left[C o\left(N H_{3}\right)_{6}\right]^{3+}=$

(d) $\left[N i\left(N H_{3}\right)_{6}\right]^{2+}=$