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Catalysis – Homogeneous and Heterogeneous
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Which one is an example of heterogenous catalysis?A Combination between dinitrogen and dihydrogen to form ammonia in the presence of finely divided iron.B Oxidation of sulphur dioxide into sulphur trioxide in the presence of oxides of nitrogen.C Hydrolysis of sugar catalysed by $H^+$ ions.D Decomposition of ozone in presence of nitrogen monoxide.
Solid iron catalysing gaseous $N_2+H_2$ is heterogeneous (different phases).
When the reactants and the catalyst are in different phases, the catalysis is known as heterogenous catalysis. 1. $N_2(g)+3H_2(g)\xrightarrow{Fe(s)}2NH_3(g)$ (Heterogenous catalysis) 2. $2SO_2(g)+O_2(g)\xrightarrow{NO(g)}2SO_3(g)$ (Homogenous catalysis) 3. $C_{12}H_{22}O_{11}(aq)+H_2O(l)\xrightarrow{H^+(aq)}C_6H_{12}O_6(aq)+C_6H_{12}O_6(aq)$ (Homogenous catalysis) 4. $O_3(g)+NO(g)\rightarrow NO_2(g)+O_2(g)$ (Homogenous catalysis)