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2. Electrochemistry — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistry2. Electrochemistry1 Mark
MCQ
Pure conc. $HN{O_3}$makes iron passive as the surface is covered with protective layer of
  • A
    $F{e_2}{O_3}$
  • B
    $FeO$
  • ✓
    $F{e_3}{O_4}$
  • D
    $Fe{(N{O_3})_3}$
✓

Answer

Correct option: C.
$F{e_3}{O_4}$
c
(c)The passivity of iron is due to the formation of a thin insoluble and invisible iron film on surface which prevents its further reactions. The film is due to the formation of $F{e_3}{O_4}$.

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