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Is the plaster of Paris useful in setting a solid mass?(a) Yes(b) No(c) Maybe(d) Cannot sayI had been asked this question during an internship interview.The question is from s-Block Elements in chapter s-Block Elements of Chemistry – Class 11

Answer»

The correct choice is (a) Yes

To explain: When plaster of Paris or CALCIUM sulphate hemihydrate which is given by the chemical formula CaSO4.1/2H2O is mixed with water, it forms of plastic mass which sets into a solid mass with SLIGHT expansion due to dehydration and its REVERSE CONVERSION into GYPSUM.



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