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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.
Explanation
Solid iron catalysing gaseous $N_2+H_2$ is heterogeneous (different phases).
Detailed Solution
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)