Iron becomes passive by ..................... | vedclass

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Question

(B) Iron $(Fe)$ becomes passive when treated with concentrated nitric acid $(HNO_3)$.This passivity is due to the formation of a thin,non-reactive,and

Vedclass · Accepted Answer

$80\% 	ext{ conc. } HNO_3, Fe_3O_4$

Vedclass · Answer

(B) Iron $(Fe)$ becomes passive when treated with concentrated nitric acid $(HNO_3)$.This passivity is due to the formation of a thin,non-reactive,and protective oxide layer on the surface of the metal.The oxide formed is iron($II$,$III$) oxide,which is $Fe_3O_4$ (or sometimes represented as $Fe_2O_3 \cdot FeO$).Therefore,the correct answer is $80\% 	ext{ conc. } HNO_3$ and $Fe_3O_4$.

Iron becomes passive by ..................... due to formation of .....................

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