Which of the following substances has a giant covalent structure?
Correct answer: C. Silica
- A. Iodine crystal
- B. Solid CO2
- C. Silica
- D. White phosphorus
Explanation
Silica tends to form long-chain covalent structures such as carbon so it has a giant covalent structure. Diamond and graphite (forms of carbon) and silicon dioxide (silica) are examples of giant covalent structures (lattices) of atoms. All the atoms in these structures are linked to other atoms by strong covalent bonds and so they have very high melting points.
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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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