Question: a. i. Define polymorphism and distinguish the two main types of polymorphism. ii. Write a short note on polymorphic transformations in the silica system. b.

 a. i. Define polymorphism and distinguish the two main types of

a. i. Define polymorphism and distinguish the two main types of polymorphism. ii. Write a short note on polymorphic transformations in the silica system. b. Using the Clausius - Clapeyron relationship, derive an expression for the pressure on the system (P) in terms of the temperature of the system for an evaporation phase equilibrium. [Take the heat of vaporization to be Hvap.] c. The following phases are known to exist in a system at constant pressure: Cordierite (2MgO2Al2O35SiO2) Mullite (3Al2O32SiO2) Forsterite ( 2MgOSiO2) Protoenstatite ( MgOSiO2) Periclase (MgO) i. What are the components of the system? ii. Could all of the above-listed phases coexist at equilibrium? Explain. 25 Marks

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