Which of the following chemical reactions is an irreversible reaction?

  • A
    $H_2 + I_2 \rightleftharpoons 2HI$
  • B
    $AgNO_3 + NaCl \rightarrow AgCl + NaNO_3$
  • C
    $CaCO_3 \rightleftharpoons CaO + CO_2$
  • D
    $O_2 + 2SO_2 \rightleftharpoons 2SO_3$

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