Class 12 Chemistry The Solid State Molecular Solids

Molecular Solids

Solid composed of molecules as constituent particles. These solids can further be categorized into following types:

  • Non polar Molecular Solids:
  • They are composed of either atom.
  • H2, Cl2 and I2.are some of the typical example.
  • In non-polar Molecular solids the comprised atoms or molecules are held together by weak dispersion forces or London forces.
  • They are soft and non-conductors of electricity.
  • They have low melting points and usually exist in liquid or gaseous state at room temperature and pressure.

         


(ii) Polar Molecular Solids:

  • The molecules like HCl, SO2, are formed by polar covalent bonds.
  • In polar Molecular solids the comprised atoms or molecules are held together by stronger dipole-dipole interactions.
  • They are soft and non-conductors of electricity.
  • The melting points of these solids are higher than those of non-polar molecular solids and usually exist in liquid or gaseous state at room temperature and pressure.
  • Molecules like SO2 and solid NH3 are some examples of such solids.

      

 


(iii) Hydrogen Bonded Molecular Solids:

  • Hydrogen Bonded Molecular Solids contain polar covalent bonds between H and F, O or N atoms.
  • Strong hydrogen bonding binds molecules of such solids like H2O (ice).
  • They are non-conductors of electricity and are volatile liquids or soft solids under room temperature and pressure.

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