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A catalyst is a substance that enhances ...

A catalyst is a substance that enhances the rate of a reaction. There are two types of catalysis i.e., homogeneous and heterogeneous. The heterogeneous catalysis is an important application in automobile catalytic converters,
As a student of chemistry, what chemical process do the you think occurs in the heterogeneous catalysis converters?

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The catalytic converter, which is a part of automobile exhaust system, oxidises CO to `CO_2` and NO to `N_2` gases.
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