What is the molecular formula of Gypsum?

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CaS O_{4} . 2 H_{2} O

CaO

Ca (OH)_{2}

CaC O_{3}

answer is B.

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Detailed Solution

The molecular formula of Gypsum is $CaS O_{4} . 2 H_{2} O$ .

Since the plaster of Paris is calcium sulphate which has the formula CaSO4.½H2O, it readily absorbs moisture(water) from the environment. If water of crystallization is added to it, it forms gypsum material, and its reaction is given as:

CaSO₄.1/2H₂O (plaster of Paris) + 3/2 H₂O(water) $\to$ CaSO₄.2H₂O(gypsum)

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