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

  • question_answer   An ore on treatment with dilute hydrochloric acid gives a smell like that of rotten eggs. What type of ore is this? How can it be concentrated? How can the metal be obtained from the concentrated ore?  


                      The gas which smells like that of rotten eggs is H2S. Hence, the ore is a sulphide ore. It is concentrated by froth-floatation process. The metal is obtained from the concentrated ore in the following two steps: (i) Roasting: Heating the ore strongly in the presence of air. The metal sulphide is converted into metal oxide along with evolution of sulphur dioxide gas. Metal sulphide + O2    Metal oxide + SO2 (ii) Reduction with carbon; On heating the metal oxide with carbon, it is reduced to free metal. Metal oxide + CarbonMetal + Carbon monoxide

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