Question

Give reason why phthalene balls disappear with time without leaving any solid

Answer 1

This occurs due to sublimation..

Answer 2

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.