Which of the following is pseudo solid_____________________?
Correct answer: C. Glass
- A. CaF2
- B. NaCl
- C. Glass
- D. Diamond
Explanation
Glass is an amorphous or pseudo-solid: it has rigidity like a solid but lacks the long-range regular arrangement of particles found in crystalline solids. CaF2, NaCl and diamond possess ordered crystal lattices. Students may choose diamond because it is hard and unusual, but hardness is unrelated to whether a solid is crystalline or amorphous.
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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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