A compound X on heating at 373K gives Y which is used for making chalk and for plastering fractured bones. Y on mixing with water changes to X. Identify X and Y and write chemical reactions involved.

X is CaSO​4.2H2O (Gypsum)
Y is CaSO4. 1/2H2O (Plaster of Paris)
CaSO4.2H2O ---373K----> CaSO4.1/2H2O + 1` 1/2H2O

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