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Question

Choose the correct option regarding the uses of Plaster of Paris.

A
It is used for making glass
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B
It is used in soda-acid fire extinguisher.
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C
It is used by doctors for supporting fractured bones.
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D
It is used for making soaps.
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Solution

The correct option is C It is used by doctors for supporting fractured bones.
Plaster of Paris (CaSO4.0.5H2O) is a white powder which on mixing with water sets into hard solid mass due to formation of gypsum(CaSO4.2H2O).

CaSO4.0.5H2O+1.5H2OCaSO4.2H2O

Therefore, Plaster of Paris is used for supporting fractured bones in the right position.

Washing soda is used for making glass, papers and soap.

Baking soda is used in soda-acid fire extinguisher.

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