Of the following complex ions, the one that probably has the largest overall formation constant , `K_(f)`, is

Options

A. `[Co(NH_(3))_(6)]^(3+)`
B. `[Co(H_(2)O)_(6)]^(3+)`
C. `[Co(NH_(3))_(2)(H_(2)O)_(4)]^(3+)`
D. `[Co (e n)_(3)]^(3+)`

Answer

D

Explanation

order of `K_(f)=4 gt 1 gt 2 gt 3`
`[Co(e n)_(3)]^(3+)` has highest value of `K_(f)` among complex due to chelation