[Pb. PMT 1999]
A) 1/2 and 2
B) 2 and ½
C) 2 and 1
D) 5 and 2
Correct Answer: B
$ CaSO_4.2H_2O $ - Gypsum $ CaSO_4.\frac{1}{2}H_2O $ - Plaster of paris
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