The temperature at which solid melts to become a liquid at the atmospheric pressure is called its melting point. The melting point of a solid is an indication of

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NDA (Held On: 17 Apr 2016) General Ability Test Previous Year paper

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Answer 1

The correct answer is option 1 i.e. Strength of the intermolecular forces of attraction.

Intermolecular forces

Intermolecular forces are the attractive and repulsive forces that arise between the molecules of a substance.
Intermolecular forces are mainly responsible for the physical characteristics of the substance.
The stronger the noncovalent interactions between molecules, the more energy that is required, in the form of heat, to break them apart.
The boiling point and melting point of a substance is proportional to the strength of its non-covalent intermolecular forces i.e. the stronger the intermolecular forces, the higher the boiling point and melting point. Hence option 1 is correct.
The strongest intermolecular force is the hydrogen bond.
The weakest intermolecular forces are London dispersion forces.