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