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ICSE Class 10 Chemistry Question 1 of 23

Model Paper 1 — Question 3

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Question

Question 1(iii)

Among the following compounds, identify the compound that has all three bonds (ionic, covalent and coordinate bonds).

  1. Ammonia
  2. Ammonium chloride
  3. Sodium hydroxide
  4. Calcium chloride
Answer

Ammonium chloride

Reason —

  • Covalent bonds: Within the NH4+ ion, the N–H bonds are covalent.
  • Coordinate bond: The lone pair from nitrogen forms a coordinate (dative) bond with a proton (H+) to form the NH4+ ion.
  • Ionic bond: The electrostatic attraction between the NH4+ cation and the Cl- anion constitutes the ionic bond in the crystal.