Plaster of Paris hardens by

(a) giving off CO2

(b) changing into CaCO

(c) giving out water 

(d) utilising water

 

Solution:

Plaster of Paris hardens by utilising water.

2CaSO4. H2O → CaSO4.2H2O → CaSO4. 2H2O (Hard)

Hence option d is the answer.

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