In which of the following ions, the colour is not due to d-d transition?

Options

A. `Ti(H_(2)O)_(6)^(3+)`
B. `CoF_(6)^(3+)`
C. `CrO_(4)^(2-)`
D. `[Cu(NH_(3))_(4)]^(2+)`

Answer

C

Explanation

In `CrO_(4)^(2-)`, Cr is in `+6` oxidation state.It has `d^(0)` configuration .The coloure is dueto charge transfer and not due to d-d transition