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Dead burnt plaster is ....

Dead burnt plaster is ______.

A

`Ca SO _(4) . 2H_(2)O`

B

`Mg SO _(4). 7 H _(2) O`

C

`C a SO _(4) . 1//2 H _(2) O`

D

`Ca SO _(4)`

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The correct Answer is:
D
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