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Question

Which of the follownig is/are examples of polar molecular solids?

A
HCl (s)
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B
SO2 (s)
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C
NH3 (s)
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D
NaCl (s)
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Solution

The correct option is C NH3 (s)
Polar Molecular solids :
The molecules of substances like HCl (s),SO2 (s), NH3 (s)are formed by polar covalent bonds.
The molecules in such solids are held together by relatively stronger dipole-dipole interactions. These solids are soft and non-conductors of electricity.
Their melting points are higher than those of non polar molecular solids yet most of these are gases or liquids under room temperature and pressure.
Example :
Dipole-Dipole interactions in HCl

Option (d) :
NaCl (s) is an example of ionic solid, which has coulombic force of attraction

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