Chemical formula of plaster of paris:
Chemical formula of plaster of paris:
ACaSO₄
BCaSO₄.2H₂O
CCaSO₄.1/2 H₂O
DCaSO₄.H₂O
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correct answer is: option c (CaSO₄.1/2 H₂O)
Explanation: Plaster of Paris is a hemihydrate of calcium sulfate. This means it contains half a molecule of water for every molecule of calcium sulfate. The chemical formula accurately reflects this ratio. When mixed with water, it rehydrates to form gypsum (CaSO₄.2H₂O), which is a hard, solid material.
- Option A: CaSO₄ is the formula for anhydrous calcium sulfate (anhydrite), meaning it contains no water of crystallization.
- Option B: CaSO₄.2H₂O is the chemical formula for gypsum, which is calcium sulfate dihydrate.
- Option C: CaSO₄.1/2 H₂O is the correct chemical formula for Plaster of Paris, representing the hemihydrate form.
- Option D: CaSO₄.H₂O would represent calcium sulfate monohydrate, which is not the chemical formula for plaster of paris.
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