Statement 1 (S1): Upon heating, the kinetic energy of particles increases, due to which vibration motion of particles increases and melting begins.
Statement 2 (S2): The melting point of a solid is an indication of the strength of the force of attraction between its particles.

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Solution

The correct answer is option (c).

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Melting point of a solid is an indication of the strength of the force of attraction between its particles.

Q. Assertion :On heating a substance to its melting point, inter-particle space increases. Reason: When a substance is heated, the kinetic energy of the particles(molecules/atoms) increases, due to which they push each other farther than their mean position.

Assertion: On heating a solid, its particles start vibrating vigorously.

Reason: At the melting point, the particles of the solid acquire sufficient kinetic energy to overcome the strong forces of attraction between them and move away from their positions, thus, the solid changes into a liquid.

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Assertion (A): Particle motion always increases with rise in the temperature.

Reason (R): Upon heating the kinetic energy of the particles increases and that leads to increase their motion.

Q. The melting points of three solids X, Y and Z are 298K, 310K and 400K, respectively. Arrange these in increasing order of their inter-particle force of attraction.

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Statement 1 (S1): Upon heating, the kinetic energy of particles ​increases, due to which vibration motion of particles increases and melting begins.​ Statement 2 (S2): The melting point of a solid is an indication of the strength of the force of attraction between its particles.​ ​

The correct answer is option (c).

Statement 1 (S1): Upon heating, the kinetic energy of particles increases, due to which vibration motion of particles increases and melting begins.
Statement 2 (S2): The melting point of a solid is an indication of the strength of the force of attraction between its particles.