Which of the following is a covalent network solid?
Correct answer: D. Diamond
- A. Ice
- B. Sodium chloride
- C. Solid carbon dioxide
- D. Diamond
Explanation
In diamond every carbon is covalently bonded to four others in a continuous three dimensional network, so melting it means breaking covalent bonds and the melting point is above 3500 degrees Celsius. Ice and dry ice are molecular solids held by hydrogen bonds and dispersion forces respectively, and sodium chloride is ionic. Silicon dioxide and silicon carbide are the other standard network examples.
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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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