Which of the following general reactions is an example of heterogeneous catalysis?

  • A
    $A_{2(g)} + B_{2(g)} \xrightarrow{C_{(g)}} 2 AB_{(g)}$
  • B
    $A_{(s)} + B_{(s)} \xrightarrow{C_{(s)}} D_{(s)}$
  • C
    $A_{(g)} + B_{(g)} \xrightarrow{C_{(s)}} D_{(g)}$
  • D
    $A_{2(g)} + B_{2(g)} \xrightarrow{C_{(g)}} D_{(s)}$

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