First slide

Alkaline earth metals

Question

Plaster of Paris is

Moderate

A

${CaSO}_{4} \cdot H_{2} O$
B

${CaSO}_{4} \cdot 2 H_{2} O$
C

$2 {CaSO}_{4} \cdot H_{2} O$
D

${CaSO}_{4} \cdot 5 H_{2} O$

Solution

In plaster of paris the ratio between CaSO₄ and H₂O is 2:1

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