This is not a molecular solid.
Correct answer: C. Boron Nitride
- A. Sugar
- B. Ice
- C. Boron Nitride
- D. Solid Iodine
Explanation
Option C is correct since boron nitride exists as a giant molecular structure and has a structure similar to graphite. Option A is incorrect since sugar consists of sugar molecules associated with hydrogen bonds. It is a molecular solid. Option B is incorrect since ice contains water molecules associated with hydrogen bonds. It is a molecular solid. Option D is incorrect since solid iodine is a molecular solid with weak intermolecular forces of attraction. It is a molecular solid.
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About Ionic and Molecular Crystals
Ionic crystals contain oppositely charged ions held by electrostatic forces, whereas molecular crystals contain discrete molecules joined by weaker intermolecular forces. Their structures explain differences in melting point, hardness, volatility, solubility and electrical conductivity, especially between solid and molten states.
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