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STD 12 - 4. d and f- block elements — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 12 - 4. d and f- block elements4 Marks
MCQ
Iron becomes passive by ..................... due to formation of .....................
  • A
    dil. $HCl, Fe_2O_3$
  • ✓
    $80\%$ conc. $HNO_3, Fe_3O_4$
  • C
    conc. $H_2SO_4, Fe_3O_4$
  • D
    conc. $HCl, Fe_3O_4$
✓

Answer

Correct option: B.
$80\%$ conc. $HNO_3, Fe_3O_4$
b

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