Which of the following complex ion`(s)` is/are not expected to absorb visible light?

Options

A. `[Sc(H_2 O_3)(NH_3)]^(3+) `
B. `[Ti(en)_2 (NH_3)_2 ]^(4+)`
C. `[Cr(NH_3)_6]^(3+)`
D. `[Zn(NH_3)_4]^(2+)`

Answer

C

Explanation

`[Cr(NH_3)_6]^(3+)` show colour due to partially filled d-orbital. While other complexes have `d^0` configuration and thus they are colourless.