Question

Naphtalene balls disappears with time without leaving any solid

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.

hope it helps you

Answer 2

Answer:

Naphthalene balls disappear with time without leaving any solid because they undergo sublimation

i.e., they directly change into vapour without passing through the liquid state.