Chemistry · Surface Chemistry

NEET (UG) 2023 — Question 49

Which one is an example of heterogenous catalysis?

Option A:
Hydrolysis of sugar catalysed by $\mathrm{H}^{+}$ ions
Option B:
Decomposition of ozone in presence of nitrogen monoxide.
Option C:
Combination between dinitrogen and dihydrogen to form ammonia in the presence of finely divided iron.
Correct
Option D:
Oxidation of sulphur dioxide into sulphur trioxide in the presence of oxides of nitrogen.

Answer: C

Combination of $\mathrm{N}_2$ and $\mathrm{H}_2$ to form $\mathrm{NH}_3$ in

presence of finely divided Fe is an example of heterogeneous catalysis.

\mathrm{N}_2(\mathrm{~g})+3 \mathrm{H}_2(\mathrm{~g}) \xrightarrow{\mathrm{Fe}(\mathrm{~s})} 2 \mathrm{NH}_3(\mathrm{~g})

All other are examples of homogeneous catalysis.

\begin{aligned} & \mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11}(\mathrm{aq})+\mathrm{H}_2 \mathrm{O}(\mathrm{l}) \xrightarrow{\mathrm{H}_2 \mathrm{SO}_4(\mathrm{l})} \text { Glucose(aq)+Fructose(aq) } \\ & 2 \mathrm{SO}_2(\mathrm{~g})+\mathrm{O}_2(\mathrm{~g}) \xrightarrow{\mathrm{NO}(\mathrm{~g})} 2 \mathrm{SO}_3(\mathrm{~g}) \end{aligned}

Answer key and solution verified before publishing.

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