Which one of the following has no sharp melting point?
Correct answer: C. Graphite
- A. Gemstone
- B. Calcium oxide
- C. Graphite
- D. Diamond
Explanation
When we talk about melting points, we're referring to the temperature at which a substance changes from a solid to a liquid. Most substances have a specific temperature at which this transition occurs, but graphite is a bit different. Instead of melting into a liquid, graphite undergoes sublimation. This means that it goes directly from a solid to a gas when heated, without passing through a liquid phase. So, graphite doesn't have a sharp melting point like other substances. It gradually turns into a gas as it is heated.
This question appeared on the KMU Centralized Admission Test 2020 paper, which you can sit online with every answer explained.
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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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