When a liquid X is added to a grey powdery substance Y. The substance Y slowly sets into a hard mass. A thick paste of substance Y and sand made in liquid X is used for plastering the walls of houses. Answer the following-
a. What could the liquid X be?
b. Name the substance Y.
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b. Y is probably plaster of Paris
CaSO4.1/2H2O+11/2H2O=>CaSO4.2H2O