Which one of the following reactions is an example of heterogeneous catalysis?
- A$2 CO_{(g)} + O_{2(g)} \xrightarrow{NO_{(g)}} 2 CO_{2(g)}$
- B$2 SO_{2(g)} + O_{2(g)} \xrightarrow{NO_{(g)}} 2 SO_{3(g)}$
- C$2 CO_{(g)} + O_{2(g)} \xrightarrow{Pt_{(s)}} 2 CO_{2(g)}$
- D$CH_3CHO_{(g)} \xrightarrow{I_{2(g)}} CH_{4(g)} + CO_{(g)}$
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