Iron becomes passive by ..................... due to formation of .....................

  • A

    dil. $HCl, Fe_2O_3$

  • B

    $80\%$ conc. $HNO_3, Fe_3O_4$

  • C

    conc. $H_2SO_4, Fe_3O_4$

  • D

    conc. $HCl, Fe_3O_4$

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