Question

Which of the following transition metal is not coloured?

Options

• Cu⁺ 

• V³⁺ 

• Co²⁺ 

• Ni²⁺

Answer 1

Cu⁺ 

Explanation:

Cu⁺ = 29 [Ar] 3d¹⁰ 4s⁰ 

∴ No electron is left unpaired. Cu⁺, a transition metal, lacks color as a result.