Question

3. Give reason for the following observations.
(a) Naphthalene balls disappear with time without leaving
any solid.
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Answer 1

Answer:

Naphthalene undergoes sublimation easily i.e., the change of state of naphthalene from solid to gas without the intervention of the liquid state. Thus, naphthalene balls keep on forming naphthalene vapours which disappear into the air with time without leaving any solid

Answer 2

Without leaving any solid naphthalene balls sublime and they directly change into vapour. For this reason, napthalene balls diasappear with tume without leaving any solid.