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Plaster of paris on losing water and gai...

Plaster of paris on losing water and gaining water gives `A` and `b`. Identify `A` and `B`.

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Plaster fo paris is `CaSO_(4).(1)/(2)H_(2)O`
On losing water, it forms `CaSO_(4)`
`CaSO_(4).(1)/(2)H_(2)Orarrunderset((A)"Dead burn plaster")(CaSO_(4)+(1)/(2)H_(2)O)`
On gaining water, it forms `CaSO_(4).(1)/(2)H_(2)O+(3)/(2)H_(2)Orarrunderset((B) "Gypsum")(CaSO_(4).2H_(2)O)`
`(A)` and `(B)` are `CaSO_(4)` and `CaSO_(4).2H_(2)O` respectively.
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