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Question a. Explain the term corrosion. [2 marks] b. What are the conditions necessary for corrosion of metals to occur? [2 marks] C. How does the zinc coating in galvanized iron provide protection for the underlying iron? Use the assistance of balanced chemical equations to assist your explanation. [5 marks] d. Explain two other ways that important metals such as iron may be protected from corrosion. [4 marks] e. With the aid of an appropriate diagram explain the rusting of iron. [7 marks] f. Metals do not exist in their pure form in nature but as ores consisting of the metal and impurities. With the aid of a labelled diagram, explain the extraction process involved in the extraction of either aluminium or iron from their ores. All necessary reactions must be shown. [10 marks]