Question

Plaster of Paris on making paste with little water sets to hard
mass due to formation of
(a) CaSO₄ (b) CaSO₄.1/2H₂O
(c) CaSO₄.H₂O (d) CaSO₄.2H₂O

Answer 1

Answer:

Options B should be correct..

Answer 2

The correct option is (d) CaSO₄.2H₂O

Explanation:

• Plaster of Paris on making a paste with little water sets to hard

        mass due to formation of water of hydration.  

• The Water of hydration is not bonded directly into the ions of the crystals.

• It is present within the crystals bounded stoichiometrically.
• This is responsible to provide strength and hardness of the crystal.
• It is also called as water of crystallization.