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Question

Question: Plaster of Paris hardens by :...

Plaster of Paris hardens by :

A

Giving off CO2

B

Utilising water

C

Changing into CaCO3

D

Giving out water

Answer

Utilising water

Explanation

Solution

2CaSO4H2O2 \mathrm { CaSO } _ { 4 } \mathrm { H } _ { 2 } \mathrm { O } Plaster of Paris→SettingH2O\underset{H_{2}O}{\overset{\quad Setting\quad}{\rightarrow}}

→Hardening\overset{\quad Hardening\quad}{\rightarrow}