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JEE Main levelSingle correct optionDifficulty 2 of 3sb189

Plaster of Paris is heated well above 473 K, but below the temperature at which sulfate decomposes. The product is

  1. Agypsum,
  2. B and
  3. Canhydrous , which sets only very slowly (dead burnt plaster)
  4. Danhydrous , which sets faster than plaster of Paris

Answer: C

Further heating removes the remaining water and gives anhydrous , called dead burnt plaster. It takes up water very slowly, so it does not set readily.
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