Answer: 60°.
- A 90°
- B 109°28'
- C 120°
- D 60°
Correct answer: D. 60°
Explanation: White phosphorus is a tetrahedral P<sub>4</sub> molecule in which each P-P-P angle is only 60°, causing high angular (ring) strain and making it very reactive.
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.