The chemical reaction that involves roasting process is

The chemical reaction that involves roasting process is
  1. $\mathrm{Fe}_2 \mathrm{O}_3+3 \mathrm{CO} \longrightarrow 2 \mathrm{Fe}+3 \mathrm{CO}_2$
  2. $2 \mathrm{Al}+\mathrm{Fe}_2 \mathrm{O}_3 \longrightarrow 2 \mathrm{Fe}+\mathrm{Al}_2 \mathrm{O}_3$
  3. $2 \mathrm{ZnS}+3 \mathrm{O}_2 \longrightarrow 2 \mathrm{ZnO}+3 \mathrm{SO}_2$
  4. $\mathrm{FeO}+\mathrm{SiO}_2 \longrightarrow \mathrm{FeSiO}_3$

Solution

Roasting is the process of heating of sulphide ores in excess of air to convert them into oxides. Thus, reactions, $2 \mathrm{ZnS}+3 \mathrm{O}_2 \longrightarrow 2 \mathrm{ZnO}+3 \mathrm{SO}_2$ occurs during roasting process.

Asked in: AP EAMCET 2010

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