Question

Formation of coloured ions by transition metals signifies;

• A. absorption of light from UV range
• B. emission of light
• C. presence of unpaired electrons in s and p orbitals
• D. complimentary colours to the absorbed light

Answer 1

Answer: (D)

Transition metals due to the presence of partially filled d-orbitals, are coloured.

The unpaired electron present in partially filled $d$ -orbital is excited to the higher energy $d$ -orbital by absorbing energy from visible light and thus exhibits the complementary colour. Due to which the transition metal ions appear coloured.