s-Block ElementsHard

Question

Plaster of Paris hardens by :

Options

A.giving off CO2
B.utilising water
C.changing into CaCO3
D.giving out water

Solution

2CaSO4.H2O CaSO4.2H2O CaSO4.2H2O
plaster of Paris                     Orthorhombic                             Monoclinic

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