Question : Which of the following is known as ‘Plaster of Paris’?
Option 1: 2CaSO4. 2H2O
Option 2: 2MgSO4.H2O
Option 3: 2MgSO4.7H2O
Option 4: 2CaSO4.H2O
Correct Answer: 2CaSO 4 .H 2 O
Solution : The correct option is 2CaSO 4 . 2H 2 O .
The compound 2CaSO 4 ·2H 2 O is known as Plaster of Paris. Plaster of Paris is a common name for calcium sulphate hemihydrate, and its chemical formula is exactly 2CaSO 4 ·1/2H 2 O. It is widely used in construction and other applications, particularly for making moulds and casts.
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