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Question

When Gypsum is heated to 393K, it forms:


A

CaSO4.1/2H2O

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B

Dead burnt plaster

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C

CaSO4.5H2O

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D

Anhydrous CaSO4

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Solution

The correct option is A

CaSO4.1/2H2O


  • When Gypsum (Calcium sulfate dihydrate) is heated to 393 K, it forms Plaster of Paris (Calcium sulfate hemihydrate).
  • The reaction can be given as follows: CaSO4.2H2O(aq)393KCaSO4.1/2H2O(s)+3/2H2O(l)(Gypsum)(Plasterofparis)(Water).
  • From the above reaction, it is clear that the product formed is CaSO4.1/2H2O(Plaster of Paris).

Hence, among the given options, option (a) CaSO4.1/2H2O is correct and all the other options are incorrect.


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