1.

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

Answer»

`Fe_(2)O_(3)`
`FEO`
`Fe_(3)O_(4)`
`FE(NO_(3))_(3)`

SOLUTION :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_(3)O_(4).`


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