JEE Main · 2022 · 26 Jun 2022 · Shift 2 · Chemical Bonding and Molecular Structure

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Amongst , , and , the number of species with two lone pairs of electrons is ______.

Answer: 2

Solution

Let's determine the number of lone pairs on the central atom in each species:
  • SF₄: S has 6 valence electrons, 4 are used in bonding with F atoms, leaving 2 electrons = 1 lone pair
  • XeF₄: Xe has 8 valence electrons, 4 are used in bonding with F atoms, leaving 4 electrons = 2 lone pairs
  • CF₄: C has 4 valence electrons, all 4 are used in bonding with F atoms = 0 lone pairs
  • H₂O: O has 6 valence electrons, 2 are used in bonding with H atoms, leaving 4 electrons = 2 lone pairs

Species with exactly 2 lone pairs: XeF₄ and H₂O
Answer = 2

JEE Main · 2022 · 26 Jun 2022 · Shift 2 · Integer answer

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