Question

give reason naphthalene balls disappear with time without living any solid.

Answer 1

as naphthalene is a sublimating substance which directly converts into gas from solid.under normal conditions it undergoes sublimation.that's why naphthalene balls disappear with time without living any solid.
other examples are iodine,camphor etc.

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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.