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Q. Plaster of Paris:
  1. changes into gypsum on mixing with water
  2. is CaSO4.2H2O
  3. is used for decoration
Which of the above is / are correct?
Answer: Only 1 and 3
Notes: Plaster of Paris is formed from gypsum. The gypsum is heated to 150°Celsius and becomes a dry powder. When this powder is mixed with water it reforms into a paste and eventually hardens into a solid. POP is used in art as a decorative material.

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