Is it true that Plaster of Paris should be stored in a moisture-proof container?

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True

False

answer is A.

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Detailed Solution

The above statement is true.
Since plaster of paris is calcium sulphate which has formula

CaS O_{4} . ½ H_{2} O

. It readily absorbs moisture(water) from the environment. If water of crystallization is added in it, it forms gypsum material and its reaction is given as

CaS O_{4} . ½ H_{2} O (plaster of paris) + 1 ½ H_{2} O (water) \to CaS O_{4} 2 H_{2} O (gypsum)

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