Which is incorrect about structure of iodine:
Correct answer: C. 1-1 (g) > 1 - 1 (s) Bond lenght
- A. Face-centered cubic
- B. Metallic appearance
- C. 1-1 (g) > 1 - 1 (s) Bond lenght
- D. 1-1 (g) < 1 - 1 (s) Bond lenght
Explanation
1-1 bond distance is 271.5 pm and it is appreciably longer than in gaseous iodine (266.6pm).Option C suggests that the bond length between iodine atoms in the gaseous state is greater than the bond length in the solid state. This is incorrect. The bond length in the solid state is greater due to intermolecular forces and lattice structures, which cause the iodine molecules to be spaced farther apart.
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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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