Select incorrect statement :

Options

A. Central metal in Vitamine `B_(12)` is `Co^(+3)`
B. The donor sites of `EDTA^(-4)` are two N- atoms and four O- atoms
C. Hybrid state of Cu in `[Cu(NH_(3))_(4)]^(+2)` is `sp^(3)`
D. `CuSO_(4(aq))` froms `K_(3) [Cu(CN)_(4)]` with excess KCN

Answer

3

Explanation

`[Cu(NH_(3))_(4)]^(+2)`
`Cu^(+2) = [Ar] 4s^(0) 3d^(9)`