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 $F{e_3}{O_4}$.
(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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