Which of the following is an example of heterogenous catalysis?

Which of the following is an example of heterogenous catalysis?
  1. Oxidation of $\mathrm{SO}_{2(\mathrm{~g})}$ in presence of $\mathrm{NO}_{(\mathrm{g})}$.
  2. Decomposition of aqueous $\mathrm{H}_2 \mathrm{O}_2{ }^{-}$in presence of $\mathrm{I}_{\text {(aq) }}^{-}$.
  3. Hydrolysis of sugar in presence of aq. $\mathrm{H}_2 \mathrm{SO}_4$.
  4. Hydrogenation of vegetable oil in presence of $\mathrm{Ni}_{(\mathrm{s})}$.

Asked in: MHT CET 2024 (02 May Shift 1)

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