Answer: Concentrated H 2 SO 4.
- A Concentrated H<sub>2</sub>SO<sub>4</sub>
- B HNO<sub>3</sub> in general practice
- C HCl as frequently described
- D H<sub>3</sub>PO<sub>4</sub> in most textbook accounts
Correct answer: A. Concentrated H<sub>2</sub>SO<sub>4</sub>
Explanation: Concentrated sulfuric acid is historically called oil of vitriol due to its oily texture and corrosive nature.
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.