Question

. Assertion : Plaster of Paris should be stored in moisture proof containers.

Reason : Plaster of Paris on coming in contact of moisture, absorbs water and reacts chemically to

form hydrated calcium sulphate, which sets to form a hard mass.
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Answer 1

Answer:

Explanation:When plaster of paris comes in cintact with moisture it react with 3/2 molecule of water then it form gypsum and due to formation of gypsum salt the Plaster of Paris is going to be hard. So to prevent it from getting hard it should be kept in moisture proof container not in exposed air

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Answer 2

Answer:

Both A and R are true and R is the correct explanation .

Explanation:

:When plaster of paris comes in cintact with moisture it react with 3/2 molecule of water then it form gypsum and due to formation of gypsum salt the Plaster of Paris is going to be hard. So to prevent it from getting hard it should be kept in moisture proof container not in exposed air .