Which of the following reactions produces hydrogen?

  • A
    $Mg + 2H_2O \to Mg(OH)_2 + H_2$
  • B
    $H_2S_2O_8 + H_2O \to H_2SO_4 + H_2O_2$
  • C
    $BaO_2 + H_2SO_4 \to BaSO_4 + H_2O_2$
  • D
    $Na_2O_2 + 2HCl \to 2NaCl + H_2O_2$

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