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प्रश्न
The compound that has the highest melting point amongst the following is:
विकल्प
Methane
Sodium chloride
Ammonia
Ethanol
MCQ
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उत्तर
Sodium chloride
Explanation:
Because NaCl is an ionic crystal with strong electrostatic (Coulomb) attractions between Na+ and Cl−, a large amount of energy is required to break the lattice and melt it. By contrast, methane, ammonia and ethanol are molecular substances held together by much weaker intermolecular forces (dispersion or hydrogen bonding), so their melting points are far lower.
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