Coordination CompoundHard

Question

In which of the following pairs of complexes the central metals/ions do have same effective atomic number ?

Options

A.[Cr (CO)6] and [Fe (CO)5]
B.[Co (NH3)6]2+ and [Ni (NH3)6]2+
C.[Cu (CN)4]3-  and [Ni (CO)4]   
D.[V(CO)6]- and [Co(NO2)6]3-

Solution

(A) EAN of Cr = 24 + 12 = 36                and   EAN of Fe = 26 + 10 = 36.
(B) EAN of Co3+ = 25 + 12 = 37          and   EAN of Ni2+ = 26 + 12 = 38.
(C) EAN of Cu+ = 28 + 12 = 36            and   EAN of Ni = 28 + 8 = 36.
(D) EAN of V- = 24 + 12 = 36                and   EAN of Co3+ = 24 + 12 = 36.

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