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B
CaSO4.2H2O
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C
CaSO4.H2O
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D
2CaSO4.3H2O
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Solution
The correct option is BCaSO4.2H2O The chemical formula for gypsum is (CaSO4.2H2O). Gypsum (CaSO4.2H2O) on heating to about 120∘C forms plaster of paris.