When plaster of Paris comes in contact with water it sets in... | Chemistry | SolveeIt

When plaster of Paris comes in contact with water it sets into a hard mass. The composition of the hard mass is

$CaSO_{4}\cdot H_{2}O$

$CaSO_{4}\cdot Ca\left(OH\right)_{2}$

$CaSO_{4}\cdot 2H_{2}O$

$CaSO_{4}\cdot 2Ca\left(OH\right)_{2}$

Answer

$CaSO_{4}\cdot 2H_{2}O$

Explanation

$\underset{\text{Plaster of Paris}}{ {2CaSO4.\frac{1}{2} H2O}}$ ${+\,3H2O \to}$ $\underset{\text{Gypsum (Hard mass)}}{ {2CaSO4 \cdot 2H2O}}$

Chemistry Question on GROUP 1 ELEMENTS