Answer:
(a) The molecules of a gas
possess high kinetic energy and very weak intermolecular forces. The molecules
move in all directions. As a result the vessel is completely filled with gas.
(b) The molecules of a gas possess high
kinetic energy and random motion the molecules keep hitting the walls of the
container. As a result, the pressure is exerted by the gas.
(c) Naphthalene is a volatile solid; therefore,
it changes into vapour completely and no solid is left. Sublimation of
naphthalene occurs.
(d) Solids have very strong
intermolecular attraction among their particle while intermolecular attraction
is very poor in case of gases. Due to the reason, we are able to easily move
our hands in air but cannot do the same through a solid block of wood.
(e) Acetone, petrol and perfumes are
highly volatile compounds. When we place them on our palm, they evaporate at a
high rate and absorb heat from our palm; as a result, our palm feel cold.
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