1.

Dead burnt plaster is

Answer»

`CaSO_(4)`
`CaSO_(4).1/2H_(2)O`
`CaSO_(4).H_(2)O`
`CaSO_(4).2H_(2)O`

Solution :`UNDERSET("Gypsum")(CaSO_(4).2H_(2)O)OVERSET(120^(@)C)(to)underset("dead BURNT plaster")underset(CaSO_(4))underset(darrTgt120^(@)C)underset("plaster of paris")(CaSO_(4).1//2H_(2)O)`


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