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Question

Plaster of paris should be stored in a moisture proof container because:
it absorbs moisture from the atmosphere and becomes hard
it cannot be stored in plastic
it will change its colour
it will become soft

A

it cannot be stored in plastic

B

it will change its colour

C

it will become soft

D

it absorbs moisture from the atmosphere and becomes hard

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Solution

Verified by Toppr

Plaster of paris is calcium sulphate and addition of water of crystallization to it leads to formation of gypsum which becomes hard material. It should be stored in water proof container.
${C a S O}_{4} \cdot \frac{1}{2} H_{2} O + \frac{3}{2} H_{2} O \to {C a S O}_{4} \cdot 2 H_{2} O$

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