What is the transition temperature of KNO₃?
Correct answer: B. 123°C
- A. 13.2°C
- B. 123°C
- C. 12.3°C
- D. 32.38°C
Explanation
The temperature at which the allotropic forms of a substance exists in equilibrium is called transition temperature.At atmospheric pressure, when heated through the transition temperature of ∼ 123°C, potassium nitrate (KNO3) undergoes a phase transformation from an orthorhombic crystal structure (α-phase) to a rhombohedral crystal structure (β-phase).
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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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