Gypsum is______?
Correct answer: C. CaSO4,2H2O
- A. CaSO4
- B. CaSO4.1/2H2O
- C. CaSO4,2H2O
- D. CaSO4.3H2O
Explanation
Gypsum is hydrated calcium sulfate with two water molecules per formula unit, CaSO4·2H2O. The likely mistake is choosing CaSO4·1/2H2O, which is plaster of Paris, the product formed by partial dehydration of gypsum.
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About Crystalline Solids
Crystalline solids contain particles arranged in a regular repeating lattice described by a unit cell. Their study includes coordination number, packing efficiency, density, anisotropy, cleavage, polymorphism and common crystal systems, along with ionic, molecular, covalent network and metallic crystals. Crystalline order differs from the random arrangement of amorphous solids.
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