Question

naphthalene balls disappear with time without leaving any remnant

Answer 1

yes it is true, they undergoes sublimation when they are brought in contact with atmosphere. so they change their physical state from solid to gas directing without leaving any residue.
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Answer 2

Naphthalene is a sublimable substance.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.
Naphthalene is sublime at room temperature.