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Identify the correct statement

1. gypsum is obtained by heating plaster of Paris
2. plaster of Paris can be obtained by hydration of gypsum
3. plaster of Paris is obtained by partial oxidation of gypsum
4. gypsum contains a lower percentage of calcium than plaster of Paris

Correct answer: plaster of Paris can be obtained by hydration of gypsum

Solution

Plaster of Paris is obtained by heating gypsum to remove water, and it can be rehydrated to form gypsum again. This makes option B correct.

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