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

  • question_answer   Give an example of a sulphide ore which is reduced to metal by heating alone, i.e., by roasting.


                      Cinnabar (HgS) on roasting is first changed to mercuric oxide which on further heating is reduced to mercury. 2HgS(s) + 3O2(g) ® 2HgO(s)+ 2SO2(g) 2HgO(s) ®  2Hg(l) + O2(g)

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