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metals and non-metals — Science STD 10 — Question

Gujarat BoardEnglish MediumSTD 10Sciencemetals and non-metals1 Mark
MCQ
Which of the following reactions is called roasting?
  • A
    $ZnCO3(s) = ZnO(s) + CO2(g)$
  • ✓
    $2ZnS(s) +3O2(g) =  2ZnO(s) +2SO2(g)$
  • C
    $ZnO(s) + C(s)  = Zn(s) + CO(g)$
  • D
    $Zn(s) + H2O(g)  = ZnO(s) + H2(g)$
✓

Answer

Correct option: B.
$2ZnS(s) +3O2(g) =  2ZnO(s) +2SO2(g)$
$B.$ $2 ZnS ( s )+3 O _2(g) \rightarrow^\Delta 2 ZnO ( s )+2 SO _2(g)$

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