Answer: Zinc (Zn).
- A Zinc (Zn)
- B Tin (Sn)
- C Nickel (Ni)
- D Chromium (Cr)
Correct answer: A. Zinc (Zn)
Explanation: Galvanising coats iron with zinc; zinc acts as a sacrificial anode protecting iron from corrosion.
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.