State the term:
When a compound loses its water of crystallization on exposure to dry air.

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Solution

When a compound loses its water of crystallization on exposure to dry air: Efflorescence
The efflorescence substances lose their water of crystallization on exposure to air.
For example Sodium Carbonate decahydrate(Na₂SO_4.10H₂O), Magnesium Sulfate heptahydrate(MgSO₄.7H₂O) etc.

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