The plaster of paris is hardened by
The plaster of paris is hardened by
A. liberating `CO_2`
B. changing into `CaCO_3`
C. uniting with CaO
D. uniting with water
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The plaster of paris is hardened by
A. liberating `CO_2`
B. changing into `CaCO_3`
C. uniting with CaO
D. uniting with water