Question

give reason naphthalene balls disappear with time without leaving any residence

Answer 1

Due to the process of sublimation it directly convert into gaseous state from solid state.
Other ex of sublimation:-Camphor.

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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.