Which one is an example of heterogenous catalysis?

Question

1. Combination between dinitrogen and dihydrogen to form ammonia in the presence of finely divided iron. 2. Oxidation of sulphur dioxide into sulphur trioxide in the presence of oxides of nitrogen. 3. Hydrolysis of sugar catalysed by H ^+ ions. 4. Decomposition of ozone in presence of nitrogen monoxide.

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Answer: 1. Combination between dinitrogen and dihydrogen to form ammonia in the presence of finely divided iron. Key idea: In heterogeneous catalysis the catalyst is in a different phase from the reactants. In the Haber process, solid finely divided iron catalyses gaseous N₂ + H₂ : heterogeneous. The other three have catalyst and reactants in the same phase (gas with gas for NO; liquid with H^+ in solution), so they are homogeneous. Option 1.

Which one is an example of heterogenous catalysis?

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