Gypsum is chemically __________________ ?
Correct answer: D. Calcium sulphate
- A. Calcium chloride
- B. Potassium sulphate
- C. Sodium sulphate
- D. Calcium sulphate
Explanation
Gypsum is calcium sulphate dihydrate, CaSO₄·2H₂O. Calcium chloride is a different calcium salt, while the other options are sulphates of potassium and sodium.
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