Which of the following statements is incorrect ?

Options

A. The `Ni^(2+)` (aq) cation is coloured because `Ni^(2+)` ion can absorb light, which promotes electrons from the filled d-orbitals to the higher energy half filled d-orbitals
B. The `Zn^(2+)` (aq) cation is colourless because the d-orbitals are completely filled and no electrons can be promoted, so no light is absorbed
C. A complex which has just one absorption band at 455 nm, must be red coloured
D. None

Answer

C

Explanation

As it absorbs blue colour light (`lambda`=455 nm), the colour of the complex must be orange.