In which of the following pairs are both the ions coloured in aqueous solution-

In which of thc following pairs are both the ions coloured in aqueous solution ? (At no: Sc=21, Ti=22, Ni=28, Cu=29, Co=27)

In which of the following pairs, both the ions are coloured in aqueous solution?

IN which of the following pairs, both the ions are coloured in aqueous solutions ?

In which of the following paris both the ions are coloured in aqueous solution? (Atomic number, Sc - 21, Ti = 22, Ni = 28, Cu = 29, Co = 27)

Which of the following pairs are not both coloured in aqueous solution?

Which of the following pair of ions have the same colour ?