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.

    Answer:

                      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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