Question

a white powered substance (x) turns to a hard solid mass (y) in presence of water x is used in dental filling identify x and y ?​

Answer 1

Answer:

calcium sulphate hemihydrate  (CaSO4.1/2H2O) this is called plaster of Paris the substance which doctor used as plaster for supporting fractured bone on right position POP  is a white powder and  on mixing with water, it changes to gypsum once again giving a hard solid

CaSO4.1/2H2O +1+1/2H2O→ CaSO4. 2H2O

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Answer 2

Explanation:

The substance X is =gypsum

The substance y is = plaster of Paris(calcium sulphate hemihydrate)