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
Rock salt
b
Graphite
c
Copper
d
Dry ice
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;