Question

Sublimation is a change in a substance from__________state to _______________ state.

• A. solid
• B. gas

Answer 1

Sublimation:

• The process in which a solid substance directly changes from solid to gas or gas to solid on heating is known as sublimation.
• For example on heating camphor, it changes directly to the gaseous state.
• If camphor vapours are cooled, they change back to the solid crystalline state.
• Sublimation of camphor into vapour form and changing of vapours back to the solid form is a temporary and reversible change.
• There is no change in the chemical properties of camphor in its solid (crystalline) and vapour form.

Therefore, Sublimation is a change in a substance from solid-state to a gas state.