(i) Define and contrast terms ideal solution, real solution, and regular solution, each using a single, complete sentence. (ii) For a binary system comprising components A and B. draw a plot of free energy of mixing versus mole fraction of component B with three separate, labelled lines representing the following cases: An ideal solution: A regular solution with negative interaction parameter, A regular solution with positive interaction parameter, below upper critical solution temperature. (iii) On each of the three lines drawn in your answer to (ii), mark the compositions of mixtures that are most thermodynamically stable. (iv) Determine the value of interaction parameter for a binary regular mixture if its upper critical solution temperature is 505.61 K.