Question

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

विकल्प

• La³⁺ (Z = 57)

• Ti³⁺ (Z = 22)

• Lu³⁺ (Z = 71)

• Se³⁺ (Z = 21)

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.