WBCS.LIVE practice question

What is the 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 Sulfate Hemihydrate
  2. Calcium Carbonate
  3. Calcium Sulfate Dihydrate
  4. Magnesium Sulfate

Correct answer and explanation

Correct answer: Calcium Sulfate Hemihydrate

Explanation: āœ… Correct Answer: A) Calcium Sulfate Hemihydrate šŸ“š Explanation: Plaster of Paris ($CaSO_4 \cdot 1/2 H_2O$) is produced by heating gypsum ($CaSO_4 \cdot 2H_2O$) to a specific temperature of 373 K. When mixed with water, it forms a hard mass by reverting back to gypsum. It is widely used in the medical field for setting fractured bones and in the construction industry for decorative ceilings.