Question

Which among the following represents the chemical formula for ‘Plaster of Paris’?
A) CaSo4.1/2 H2O
B) CaSo4.10H2O
C) CaSo4
D) None​

Answer 1

Answer:

Chemical formula - 2CaSO4.H20

Chemical name - Calcium sulphate hemihydrate.

Preparation -

POP is prepared from gypsum.

CaSO4.2H2O(gypsum) →Heat to 100°c

CaSO4.1/2H2O(POP) + 1 1/2 H2O(water)

Multiply by 2 for balancing equn.

2( CaSO4.2H2O)( gypsum) → 2CaSO4.H2O( POP) + 3H20(water)

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Explanation:

Answer 2

Answer:

A) CaSo4.1/2 H2O

Explanation: The chemical name of plaster of Paris is calcium sulphate hemihydrate because half-molecule of water is attached with calcium sulphate. The chemical formula of plaster of Paris is CaSo4.1/2 H2O

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