When the concentration of solute in a solid solution exceeds its solubility limit, a new solid solution or phase forms that has a composition distinctly different than the original solid solution?

Answer is: true.

Solid solution is a solid state solution of one or more solutes in a solvent or mixture of two crystalline solids that coexist as crystal lattice. Examples of solid solutions are metal alloys (mixture of metals or a mixture of a metal and another element), semiconductors and moist solids.