Question

Which of the following ions will exhibit colour in aqueous solution?

Options

• 6a³⁺ (z = 57)

• Ti³⁺ (z = 22)

• Lu³⁺ (2 = 71)

• Se³⁺ 2(252)

Answer 1

Ti³⁺ (z = 22)

Explanation:

Ti³⁺ has an outer electronic configuration of 4s₂3d1 and is coloured due to an unpaired electron. There are no unpaired electrons in any other species.