7. Describe the following terms or answer the questions: (a) When the pressure is reduced, the b.p. and m.p. of water increase or decrease? Explain them according to a plot of G vs.T. (4%) (b) Describe the condition which can result in the negative deviation from Raoult's law and the condition which can result in the phase separation. (4%) (e) Osmosis (3) (d) Chemical potential (3%) (e) Colligative properties (3%) (1) The fractional crystallization is more difficult to perform than fractional distillation. Why? (3%) (8) Retrograde condensation (3%) (h) For an ideal solution, AH = 0 but A. G*0. Why? (3%) ) How to break the azeotropes? (4%) () As shown below, an upper consolute temperature was found in the phase diagram of water-aniline system (Fig. 1) while a lower consolute temperature was observed for the water-triethylamine system (Eig. 2). Explain the temperature effect on the solubility for each system. (4%)