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Pure conc. HNO(3) makes iron passive as ...

Pure conc. `HNO_(3)` makes iron passive as the surface is covered with protective layer of

A

`Fe_2O_3`

B

`FeO`

C

`Fe_3O_4`

D

`Fe(NO_3)_3`

Text Solution

Verified by Experts

The correct Answer is:
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 `Fe_3O_4`.
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