Which one of the following reactions is an example of heterogeneous catalysis?

Which one of the following reactions is an example of heterogeneous catalysis?
  1. $2 \mathrm{CO}(\mathrm{g})+\mathrm{O}_2(\mathrm{~g}) \stackrel{\mathrm{NO}(g)}{\longrightarrow} 3 \mathrm{CO}_2$
  2. $2 \mathrm{SO}_2(\mathrm{~g})+\mathrm{O}_2(\mathrm{~g}) \stackrel{\mathrm{NO}(g)}{\longrightarrow} 2 \mathrm{SO}_3$
  3. $2 \mathrm{CO}(g)+\mathrm{O}_2(\mathrm{~g}) \stackrel{\mathrm{Dt}(\mathrm{s})}{\longrightarrow} 2 \mathrm{CO}_2$
  4. $\mathrm{CH}_3 \mathrm{CHO}(\mathrm{g}) \stackrel{\mathrm{I}_2(\mathrm{~g})}{\longrightarrow} \mathrm{CH}_4+\infty$

Solution

Reaction $2 \mathrm{CO}(\mathrm{g})+\mathrm{O}_2(\mathrm{~g}) \stackrel{\mathrm{Pt}(\mathrm{s})}{\longrightarrow} 2 \mathrm{CO}_2$ is an example of heterogeneous caralysis because in it $C O$ and $\mathrm{O}_2$ are in gaseous phase and the catalyst is in solid i.e., different phase.

Asked in: MHT CET Full Test 9

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