WBCS.LIVE practice question

What is the exact chemical name of the substance commonly known as 'Plaster of Paris'?

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. Calcium Carbonate
  2. Calcium Sulfate Hemihydrate
  3. Calcium Oxide
  4. Magnesium Sulfate

Correct answer and explanation

Correct answer: Calcium Sulfate Hemihydrate

Explanation: āœ… Correct Answer: B) Calcium Sulfate Hemihydrate šŸ“š Explanation: Plaster of Paris is prepared by heating Gypsum (CaSO4.2H2O) to a specific temperature, resulting in Calcium Sulfate Hemihydrate (CaSO4.0.5H2O). It is a white powdery substance that hardens when mixed with water. It is widely used in medical casts for fractured bones and in making sculptures.