Which of the following is a pair of diamagnetic complexes -

Options

A. `[Co(NH_(3))_(6)]^(3+), [Fe(CN)_(6)]^(4-)`
B. `[Co(o x)_(3)]^(3-), [FeF_(6)]^(3-)`
C. `[Fe (o x)_(3)]^(3-),[FeF_(6)]^(3-)`
D. `[Fe(CN)_(6)]^(3-), [CoF_(6)]^(3-)`

Answer

A

Explanation

In `[Co(NH_(3))_(6)]^(3+) and [Fe(CN)_(6)]^(4-)` ions, both the central metal ions consist 6 d - electrons and forms inner orbital complexes by undergoing `d^(2)sp^(3)` hybridisation. Hence, they don't have unpaired electrons and diamagnetic in nature.