Formula of gypsum salt is

A

`(CaSO_(4))_(2).H_(2)O`

B

`2CaSO_(4)`

C

`CaSO_(4).2H_(2)O`

D

`2CaSO_(4).H_(2)O`

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The correct Answer is:

C

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Write the chemical formula of gypsum. How is it converted into plaster of Paris ?

Formula of gypsum is CaSO_(4).xH_(2) and of plaster of parts is (2CaSO_(4)).yH_(2)O , then (x- y) is equal to