(Iodine/Ammonia) ___________ is a sublimable substance.

Sublimation: The process in which a substance directly goes into a vapor state without passing through the liquid state.

• When solid iodine crystals are heated the iodine changes from a solid directly to a gas without passing through a liquid phase.
• Hence iodine undergoes sublimation.
• Example: Iodine$\left(\mathrm{I}\right)$, camphor, naphthalene, etc.

Iodine is a sublimable substance.