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Which of the following equation does not represent homogeneous catalysis?
(a) \( \mathrm{CH}_{3} \mathrm{COOCH}_{3}(l)+\mathrm{H}_{2} \mathrm{O}(l) \stackrel{\mathrm{H}_{2} \mathrm{SO}_{4}(l)}{\longrightarrow} \)
\[
\mathrm{CH}_{3} \mathrm{COOH}(\mathrm{aq})+\mathrm{CH}_{3} \mathrm{OH}(\mathrm{aq})
\]
(b) \( 4 \mathrm{NH}_{3}(\mathrm{~g})+5 \mathrm{O}_{2}(\mathrm{~g}) \stackrel{\mathrm{Pt}(\mathrm{s})}{\longrightarrow} 4 \mathrm{NO}(\mathrm{g})+6 \mathrm{H}_{2} \mathrm{O}(\mathrm{g}) \)
(c) \( 2 \mathrm{SO}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g}) \stackrel{\mathrm{NO}(\mathrm{g})}{\longrightarrow} 2 \mathrm{SO}_{3}(\mathrm{~g}) \)
(d) Both (a) and (b)
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