Which of the following reactions is reversible?

  • A
    $H_2 + I_2 \rightleftharpoons 2HI$
  • B
    $H_2SO_4 + Ba(OH)_2 \rightarrow BaSO_4 + 2H_2O$
  • C
    $NaCl + AgNO_3 \rightarrow NaNO_3 + AgCl$
  • D
    $Fe + S \rightarrow FeS$

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