The process of changing solid directly into gas is called
(a) Evaporation
(b) Condensation
(c) Sublimation
(d) Freezing

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Detailed Solution

The correct Answer: (c) Sublimation

Sublimation is the process in which a solid changes directly into its gaseous state without passing through the liquid state. This happens when certain solids gain enough energy to break free from their solid structure and directly form gas molecules.

Examples of substances that show sublimation:

Camphor (used in religious ceremonies)

Naphthalene balls (used to repel moths and insects)

Dry ice (solid CO₂), which directly converts into carbon dioxide gas when exposed to air.

This process is used in many applications such as air fresheners, freeze-drying food, and purifying substances.

Why not the other options?

(a) Evaporation – liquid → gas (not solid → gas).

(b) Condensation – gas → liquid.

(d) Freezing – liquid → solid.

Thus, the correct process for solid → gas directly is sublimation.

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