Verified Solution • 2025–26 Session moderate

QJEEM23Ch7b66: JEE Main 2023 Chemistry - Class 12 JEEM23Ch7b66 Solution: Which one of the following pairs is an example of polar…

Which one of the following pairs is an example of polar molecular solids?

Multiple Choice Options

  • A HCl(s),AlN(s)\mathrm{HCl}(\mathrm{s}), \mathrm{AlN}(\mathrm{s})
  • B MgO(s),SO2(s)\mathrm{MgO}(\mathrm{s}), \mathrm{SO}_{2}(\mathrm{s})
  • C SO2(s),NH3(s)\mathrm{SO}_{2}(\mathrm{s}), \mathrm{NH}_{3}(\mathrm{s})
  • D SO2(s),CO2(s)\mathrm{SO}_{2}(\mathrm{s}), \mathrm{CO}_{2}(\mathrm{s})

Step-by-Step Verified Solution

Polar molecular solids are formed by molecules that have polar covalent bonds and possess a net dipole moment. A net dipole moment arises when there is an asymmetric distribution of charge in the molecule, resulting in a separation of positive and negative charges.

Out of the given options, only option C consists of two polar molecular solids - SO2(s)\mathrm{SO}_2(\mathrm{s}) and NH3(s)\mathrm{NH}_3(\mathrm{s}) . SO2\mathrm{SO}_2 has polar covalent bonds due to the difference in electronegativity between sulfur and oxygen, and the molecule has a net dipole moment due to its bent molecular geometry. Similarly, NH3\mathrm{NH}_3 has polar covalent bonds due to the difference in electronegativity between nitrogen and hydrogen, and the molecule has a net dipole moment due to its trigonal pyramidal molecular geometry.

Therefore, the correct answer is - SO2(s),NH3(s)\mathrm{SO}_{2}(\mathrm{s}), \mathrm{NH}_{3}(\mathrm{s}) .

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