Which of the following equilibrium is not affected by pressure?

  • A
    $CaCO_{3(s)} \rightleftharpoons CaO_{(s)} + CO_{2(g)}$
  • B
    $N_{2(g)} + 3H_{2(g)} \rightleftharpoons 2NH_{3(g)}$
  • C
    $N_{2(g)} + O_{2(g)} \rightleftharpoons 2NO_{(g)}$
  • D
    $2SO_{2(g)} + O_{2(g)} \rightleftharpoons 2SO_{3(g)}$

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