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

Options

A. (a) `[Zn(NH_3)_6]^(2+)`
B. (b) `[Sc(H_2O)_3(NH_3)_3]^(3+)`
C. (c) `[Ti(en)_2(NH_3)_2]^(4+)`
D. (d) `[Cr(NH_3)_6]^(3+)`

Answer

D

Explanation

`{:(Ti^(4+),:3d^(0),,,),(Cr^(3+),:3d^3,,,),(Zn^2+,:3d^(10),,,),(Sc^(3+),:3d^(0),,,):}}` Completely filled or empty d-orbitals are colourless.