Q.

Solids are characterized by high melting points as compared to liquids and gases. Which one of the following class of solid will have least melting point ?

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a

Ionic solid

b

Covalent solid

c

Metallic solid

d

Molecular solid

answer is D.

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Detailed Solution

The attractive forces in molecular solids are weak Vanderwaals forces. Melting points are very low and they are very soft;

Ex; Dry ice, Iodine; Naphthalene;

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