Passivity of iron is due to the formation of

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(A) The passivity of iron is caused by the formation of a thin,non-porous,and protective layer of oxide on its surface when it is treated with concent

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$Fe_2O_3$

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(A) The passivity of iron is caused by the formation of a thin,non-porous,and protective layer of oxide on its surface when it is treated with concentrated nitric acid $(HNO_3)$.This protective layer is composed of ferric oxide $(Fe_2O_3)$.This layer prevents further reaction of the metal with the acid,making the iron passive.

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