Which has strongest bonding in the solid state ?
Correct answer: D. Sodium Chloride (NaCI)
- A. Hydrogen Chloride (HCI)
- B. Chlorine (Cl2)
- C. Xenon(Xe)
- D. Sodium Chloride (NaCI)
Explanation
Sodium chloride has a strong three-dimensional ionic lattice in which oppositely charged Na+ and Cl- ions attract each other. HCl, Cl2 and Xe are molecular or atomic solids held mainly by weaker intermolecular forces, so students may choose HCl because it is polar without recognizing that ionic attractions are stronger.
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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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