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Which one is example of heterogenous catalysis?

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An Intiative by Sri Chaitanya

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

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

Hydrolysis of sugar in the presence of sulfuric acid

Decomposition of ozone is presence of nitrogen monoxide

answer is A.

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Detailed Solution

$N_{2 (g)} + H_{2 (g)} \overset{{Fe}_{(s)}}{\to} 2 {NH}_{3 (g)}$

Here, the catalyst and the reactants are in different physical states.

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