Answer: One P-H bond is not ionisable (P directly bonded to H does not donate H+).
- A One P-H bond is not ionisable (P directly bonded to H does not donate H+)
- B The molecule actually contains mainly two hydrogen atoms in total under most conditions encountered
- C It is classified as a weak acid rather than a strong one as frequently observed in practice
- D It contains three separate -OH groups, most of which ionise in many documented cases
Correct answer: A. One P-H bond is not ionisable (P directly bonded to H does not donate H+)
Explanation: In H<sub>3</sub>PO<sub>3</sub>, two OH groups are ionisable; the third H is directly bonded to P and is non-acidic (P-H bond).
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.