Which of the following statements is NOT correct in reference to the melting point?
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A.
The temperature at which the liquid and the gaseous states of the substance are in thermal equilibrium with each other is called its melting point.
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B.
The temperature at which the solid and the liquid states of the substance are in thermal equilibrium with each other is called its melting point.
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C.
Melting point also depends on pressure.
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D.
The melting point is characteristic of the substance.
Correct Answer:
A. The temperature at which the liquid and the gaseous states of the substance are in thermal equilibrium with each other is called its melting point.
Explanation:
The melting point is the specific temperature at which a substance transitions from a solid to a liquid state. At this point, the solid and liquid phases coexist in thermal equilibrium. While the melting point is a characteristic property of a substance and is influenced by external pressure, it does not involve the gaseous state. The temperature at which liquid and gaseous states are in thermal equilibrium is known as the boiling point. Therefore, the statement suggesting that the melting point involves equilibrium between liquid and gaseous states is incorrect.
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