Question : By which of the following processes is a solid substance directly converted into gas?
Option 1: Deposition
Option 2: Sublimation
Option 3: Vaporisation
Option 4: Fusion
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Correct Answer: Sublimation
Solution : The correct answer is Sublimation.
Sublimation is the process of turning a solid directly into vapours. When the boiling point is lower than the melting point, sublimation occurs.
The heat of sublimation at a particular temperature is the amount of heat needed to convert a unit mass of solid into vapours at that temperature.
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