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The molecular formula of gypsum is...

The molecular formula of gypsum is

A

`CaSO_4 * 2H_2O `

B

`CaSO_4. (1)/(2) H_2O `

C

`3CaSO_4. H_2O`

D

`2CaSO_4. 2H_2O `

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The correct Answer is:
A
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