Which of the following statements about melting point determination is not true?

Question

Which of the following statements about melting point determination is not true? The melting point is a physical measure of the forces holding the material into its crystal lattice The presence of impurities introduces entropy, which raises the energy required to melt the substance. The lower limit of the melting temperature range occurs when the first crystal starts to melt. Pure substances typically have a melting range of less than 2 °C The upper limit of the melting temperature range occurs when the last remaining crystal melts.

Explanation / Answer

Ans : The presence of impurities introduces entropy , which raises the energy required to melt the substance.

When the impurities are introduced into the pure substance , it disrupts the crystal lattice of the substance . This increases the netropy , and hence lower amount of energy is required to melt the substance , due to which the melting point of impure material is lower than that of pure material.

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