10th Class Science Metals and Non-metals Question Bank 10th CBSE Science Metals and Non-metals

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      ore on heating in air produces sulphur dioxide. Which process would you suggest for its concentration? Describe briefly any two steps involved in the conversion of this concentrated ore into related metal. [CBSE Delhi 2009]


                      The ore on heating produces sulphur dioxide gas so it is a sulphide ore. The method used for its concentration is "froth floatation process". After concentration of the ore following two steps would be followed to convert it into metal. (i) Roasting: The sulphide ore is converted into its oxide by heating it in the presence of air. MS + O2 MO + SO2 (ii) Reduction of metal oxide to metal: The oxide formed by roasting is then reduced to metal by using a suitable reducing agent like carbon (coke). MO +   C   M   +   CO          (Coke)

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