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Q. Plaster of Paris is hardened by

Bihar CECEBihar CECE 2009The s-Block Elements

Solution:

When water is added to plaster of Paris, a substance, called gypsum that becomes hard; is formed. Thus, plaster of Paris is hardened by hydration.
$CaSO _{4} \cdot \underset{\text{Plaster of Paris}}{\frac{1}{2} H _{2} O} +1 \frac{1}{2} H _{2} O \longrightarrow \underset{\text{gypsum (hard)}}{CaSO _{4} \cdot 2 H _{2} O}$