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Which of the following reactions are examples for heterogeneous catalysis?
(a) \( 2 \mathrm{H}_{2} \mathrm{O}_{2}(l) \stackrel{\mathrm{MnO}_{2}(s)}{\longrightarrow} 2 \mathrm{H}_{2} \mathrm{O}(l)+\mathrm{O}_{2}(g) \)
(b) \( 2 \mathrm{SO}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g}) \stackrel{\mathrm{NO}(\mathrm{g})}{\longrightarrow} 2 \mathrm{SO}_{3}(\mathrm{~g}) \)
(c) \( \mathrm{H}_{2}(g)+\mathrm{C}_{2} \mathrm{H}_{4}(g) \stackrel{\mathrm{Ni}(s)}{\longrightarrow} \mathrm{C}_{2} \mathrm{H}_{6}(g) \)
(d) \( \mathrm{CH}_{3} \mathrm{COOC}_{2} \mathrm{H}_{5}(a q)+\mathrm{H}_{2} \mathrm{O}(l) \stackrel{\mathrm{HCl}(a q)}{\longrightarrow} \mathrm{CH}_{3} \mathrm{COOH}\left(a q\right. \).) \( +\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}(a q \).)
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