Q16: A) What do you understand by Gibbs phase rule, and explain in detail each term used in the Gibbs rule. B) State the mathematical expression to determine engineering and true strain and explain the differences between them. C) An iron container 10 cm x 10 cm at its base is filled to a height of 20 cm with a corrosive liquid and a current of 0.2 A is produced as a result of an electrolytic cell.

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