Answer: d-block.
- A d-block
- B s-block
- C p-block
- D f-block
Correct answer: A. d-block
Explanation: Transition metals are d-block elements (Groups 3-12) where the d orbitals are progressively filled.
Aqueous solutions of transition metal ions show characteristic colours caused by electrons absorbing visible light to jump between split d-orbitals; the exact colour depends on the metal, its oxidation state, and surrounding ligands.
Concept context
Transition metals (d-block) and lanthanides/actinides (f-block). Known for coloured compounds, variable oxidation states, complex formation, and catalytic properties. Frequently tested in JEE and NEET.