Question

Naphthalene ball disappear with time without leaving any residue. why?​

Answer 1

Naphthalene balls disappear with time as they sumblimable substances. This means that they can undergo the process of sublimation, which is the conversion of a solid substance to the gaseous state without passing through the liquid state. That is why naphthalene balls disappear without leaving any residue.

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Answer 2

Naphthalene balls disappears after some time as its surface gains kinetic energy and directly gets converted into gas. The process of converting directly into gaseous form and not in a liquid state is termed as sublimation. Hence, when naphthalene is given fire, it gets converted into gas and disappears, without leaving any residue.