The shape of KNO3 above 128˚C is:
Correct answer: C. Rhombohedral
- A. Trigonal
- B. Orthorhombic
- C. Rhombohedral
- D. Tetragonal
Explanation
The correct answer is: cubic Above 128°C, potassium nitrate (KNO3) adopts a cubic crystal structure. At temperatures below 128°C, KNO3 has a different crystal structure, which is rhombohedral.
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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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