Which of the following is an example of a heterogeneous catalysis reaction?

  • A
    $2 SO_{2(g)} + O_{2(g)} \xrightarrow{NO_{(g)}} 2 SO_{3(g)}$
  • B
    Hydrolysis of aqueous sucrose solution in the presence of aqueous mineral acid
  • C
    $2 H_2 O_{2(l)} \xrightarrow{Pt_{(s)}} 2 H_2 O_{(l)} + O_{2(g)}$
  • D
    Hydrolysis of an ester in the presence of aqueous mineral acid

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$H_2C=CH_2 + O_2 \xrightarrow{\text{aqueous medium}} CH_3CHO$. What is the catalyst used in the above green reaction?

$2 SO_{2(g)} + O_{2(g)} \stackrel{V_{2}O_{5}}{\rightleftharpoons} 2 SO_{3(g)}$ is an example of

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