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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


Team Careers360 3rd Jan, 2024
Answer (1)
Team Careers360 8th Jan, 2024

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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