When naphthalene on heating changes from the solid state directly to the gaseous state it undergoes
Answer Details
When naphthalene changes from the solid state directly to the gaseous state upon heating, it undergoes sublimation.
Sublimation is the process in which a solid directly changes into a gas without going through the liquid state. This occurs when the vapor pressure of the solid is greater than the atmospheric pressure. In the case of naphthalene, it has a high vapor pressure at room temperature and atmospheric pressure, which allows it to undergo sublimation when heated.