🧪 Chemistry · p-Block Elements (Groups 15 to 18) · NEET & JEE

Which Group 15 element forms the diatomic gas that makes up 78% of air?

Answer: Nitrogen (N₂).

A Nitrogen (N₂)
B Oxygen
C Phosphorus
D Arsenic

Correct answer: A. Nitrogen (N₂)

Explanation: Nitrogen (N₂) constitutes about 78% of the Earth's atmosphere.

Xenon tetrafluoride XeF4: a central xenon bonded to four fluorine atoms in a square-planar arrangement with two lone pairs above and below, Xe-F bond length 194 pm.

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.

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Which Group 15 element forms the diatomic gas that makes up 78% of air?

Concept context

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