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The correct order of basic character of the Group 15 hydrides is:

Answer: NH3 > PH3 > AsH3 > SbH3 > BiH3.

  • A PH3 > NH3 > AsH3 > SbH3 > BiH3
  • B BiH3 > SbH3 > AsH3 > PH3 > NH3
  • C NH3 > PH3 > AsH3 > SbH3 > BiH3
  • D NH3 > AsH3 > PH3 > SbH3 > BiH3

Correct answer: C. NH3 > PH3 > AsH3 > SbH3 > BiH3

Explanation: Basic strength falls down the group as the central atom size increases and the lone pair spreads out, giving NH3 > PH3 > AsH3 > SbH3 > BiH3.

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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