Answer: HNO 3 (nitric acid).
- A HNO<sub>3</sub> (nitric acid)
- B HNO<sub>2</sub> (nitrous acid)
- C NO<sub>2</sub>
- D NH<sub>3</sub>
Correct answer: A. HNO<sub>3</sub> (nitric acid)
Explanation: N<sub>2</sub>O<sub>5</sub> + H<sub>2</sub>O → 2HNO<sub>3</sub>; N<sub>2</sub>O<sub>5</sub> is the acid anhydride of nitric acid.
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.