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Which property tells when a solid will change into liquid?

Answer and explanation

Correct answer: Melting point

The melting point is the characteristic temperature at which a solid begins to change into a liquid under specified pressure. At this temperature, particles in the solid gain enough energy to overcome the orderly arrangement that holds them in fixed positions. The substance then changes state, although the temperature can remain constant during the change while heat is being absorbed. Thus, melting point directly tells us when the solid-to-liquid change occurs.

Option A is correct because it names the relevant property and temperature. Density tells us how much mass is present in a given volume, but it does not identify the melting temperature. Odour describes a sensory characteristic, and sound is not the property used to mark this state change. The exact melting point can vary with pressure and with the substance, but among the given choices only melting point answers the question directly.

Related tags

ChemistryNature-Of-MatterClass-11

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