Answer:
Molecular
solids : Refer ans. 3(iv)
Types of molecular solids :
Molecular solids are of three types
(a) Non-polar molecular solids
(b) Polar molecular solids
(c) Hydrogen bonded molecular solids
(a) Non-polar molecular solids : Molecular solids which consist
of either atoms or molecules formed by non-polar covalent bonds are called
non-polar molecular solids.
Example : Ar, He, Naphthalene,
etc.
In these solids constituent atoms or molecules are held by
weak London-dispersion forces.
(b) Polar molecular solids : Molecular solids which
consist of polar covalent molecules are called polar molecular solids.
Examples : Solid solid
etc.
In these solids molecules are held together by relatively strong
dipole-dipole interaction. Therefore, melting points of these solids are higher
than non-polar molecular solids.
(c) Hydrogen bonded molecular solids Molecular solids in
which molecules are held together by intermolecular hydrogen bonds are called
hydrogen bonded molecular solids.
Example : Ice
Properties of molecular solids
(a) These are soft solids.
(b) These are insulators of heat and electricity.
(c) They have low melting points.
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