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Question

During the finishing of steel, sheets of rods of steel are treated with pickling baths of Sulphuric acid. This is performed to remove the impurities (oxide layer, scales, etc.) on the surface of the steel but this process also produces a by-product in large quantities. Which of the following could be that by-product?
  1. Iron (II) Oxide
  2. Iron (II) Chloride
  3. Iron (II) Sulphate
  4. Metallic Iron is precipitated


Solution

The correct option is C Iron (II) Sulphate
What is the chief constituent of steel? It is Iron isn’t it?
Fe+H2SO4FeSO4+H2

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