Discussion
The process by which a solid melts to a liquid and another solid, both of different composition than the original is known as :
Answer: B
This is Incongruent melting.
In incongruent melting a solid does not melt to a liquid of its own composition; it breaks down into a liquid and a different solid. The classic example is orthoenstatite, which melts to forsterite plus a more silica-rich liquid, and potassium feldspar, which melts to leucite plus liquid.
Congruent melting gives a liquid of the same composition as the solid. Eutectic melting is the melting of two or more solids together at the lowest melting temperature of the system, and equilibrium melting is melting in which solid and liquid stay in equilibrium throughout; neither produces a new solid phase.
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