Question : 'Plaster of Paris' is made by partial dehydration of
Option 1: epsom salt
Option 2: gypsum salt
Option 3: blue vittriol
Option 4: green vitriol
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Correct Answer: gypsum salt
Solution : The correct answer is gypsum salt.
Plaster of paris is formed by the partial dehydration of gypsum. Gypsum has a chemical formulae CaSO 4 . 2H 2 O which on partial dehydration gives CaSO 4 . 1/2 H 2 O. It is a white powder which forms quick setting plaster after the addition of water. It is used for making casts and moulds for statues. It is also used for making fire proofing materials, chalks and in bone fractures.
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