Answer: Aluminium (Al).
- A Aluminium (Al)
- B Boron (B)
- C Gallium (Ga)
- D Indium (In)
Correct answer: A. Aluminium (Al)
Explanation: Al<sub>2</sub>O<sub>3</sub> and Al(OH)<sub>3</sub> are amphoteric: they react with both acids and bases. Boron is a non-metal with acidic oxide.
Xenon tetrafluoride (XeF4) has six electron domains around xenon — four Xe–F bonds plus two lone pairs. The lone pairs occupy opposite axial positions, leaving the four fluorine atoms in a square-planar shape (Xe–F ≈ 194 pm). Image: ChemSim, Public Domain, via Wikimedia Commons.
Concept context
Covers the nitrogen family (Group 15), oxygen family (Group 16), halogens (Group 17), and noble gases (Group 18). One of the highest-weightage inorganic chapters in NEET and JEE - includes preparation and properties of HNO₃, H₂SO₄, interhalogens, and xenon compounds.