Which of the following statements is true?
A. Unlike liquid mixtures, most solid mixtures can be modeled using the ideal solution model.
B. The eutectic point is a three-phase equilibrium between two liquid phases and one solid phase.
C. It is common for solid mixtures to possess immiscible solid phases.
D. For solid-liquid equilibrium of a mixture, the liquidus is the curve that describes an all solid state in equilibrium with the first drop of liquid.
E. None of the above are true.
A. Incorrect. Very few solid mixtures form ideal solutions. Many solid mixtures are immiscible.
B. Incorrect. Examine Figure 13-15 again. The eutectic point is an equilibrium between two solid phases and one liquid phase, not two liquid phases and one solid phase.
C. Correct. This is because miscible solid mixtures require the components to substitute for each other on a lattice (or form interstitial alloys), the conditions of which are difficult for most solid mixtures to meet.
D. Incorrect. The liquidus line describes a state where the mixture is all liquid with the first bit of solid.
E. Incorrect. One of the statements is true.
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