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

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Oxidation of sulfur dioxide into sulfur trioxide in the presence of oxides of nitrogen

Decomposition of ozone in presence of nitrogen monoxide

Combination between dinitrogen and Dihydrogen to form ammonia in the presence of finely divided iron

Hydrolysis of sugar catalyzed by H⁺ ions

answer is A.

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Detailed Solution

$N_{2 (g)} + 3 H_{2 (g)} \overset{{Fe}_{(g)}^{⟶}}{⟶} 2 {NH}_{3 (g)}$
Here, the catalyst and the reactants are in different physical states.

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