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a) Based on the electro chemistry of zinc and iron, explain how a layer of zinc on a steel surface protects the steel surface from

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a) Based on the electro chemistry of zinc and iron, explain how a layer of zinc on a steel surface protects the steel surface from corrosion. b) Briefly describe the unit processes in hydrometallurgy. c) With the aid of a flow diagram describe the Bayer process for aluminium extraction

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