Multiple choice

Plaster of Paris is

  1. CaSO4 .0.5 H2O

  2. CaSO4.2H2O

  3. CaSO4.7H2O

  4. CaSO4.3H2O
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Plaster of Paris is calcium sulfate hemihydrate with the formula CaSO₄·½H₂O (or written as 2CaSO₄·H₂O). When mixed with water, it forms gypsum (CaSO₄·2H₂O) and hardens. Option B is already gypsum, while C and D have incorrect water content.

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