Question

Why is the sublimation a physical change
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Answer 1

Answer:

The term sublimation refers to a physical change of state and is not used to describe the transformation of a solid to a gas in a chemical reaction. For example, the dissociation on heating of solid ammonium chloride into hydrogen chloride and ammonia is not sublimation but a chemical reaction.

Answer 2

sublimation is a physical change because it involves a change of state from solid to gas of a substance when it is heated.