Answer: Nitrogen (N 2 ).
- A Nitrogen (N<sub>2</sub>)
- B Oxygen
- C Phosphorus
- D Arsenic
Correct answer: A. Nitrogen (N<sub>2</sub>)
Explanation: Nitrogen (N<sub>2</sub>) constitutes about 78% of the Earth's atmosphere.
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.