Assertion $(A) :$ In the process of melting of solid there is no change in internal energy
Reason $(R) :$ Latent heat is the heat required to melt a unit mass of solid

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Both A and R are true But R is not correct explanation of A

A is false but R is true

A is true but R is not true

Both A and R are true and R is correct explanation of A

answer is D.

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Detailed Solution

Melting of a solid indeed involves a change in internal energy. When a solid melts, it absorbs heat energy from its surroundings to overcome the forces that hold its molecules or atoms in a rigid structure. As a result, the internal energy of the solid increases during the melting process.

Latent heat is the heat required to change a unit mass of solid into a liquid at its melting point, while maintaining that temperature constant. This heat energy is used to break the intermolecular forces that hold the solid together, allowing the particles to move more freely in the liquid state.

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