The passivity of iron in concentrated nitric | vedclass

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Question

(C) When iron $(Fe)$ is treated with concentrated nitric acid $(HNO_3)$,it becomes passive due to the formation of a thin,non-reactive,protective oxid

Vedclass · Accepted Answer

$A$ thin oxide layer coating on the metal

Vedclass · Answer

(C) When iron $(Fe)$ is treated with concentrated nitric acid $(HNO_3)$,it becomes passive due to the formation of a thin,non-reactive,protective oxide layer on its surface. This layer is primarily composed of $Fe_3O_4$ (or $Fe_2O_3$),which prevents further reaction of the metal with the acid. Therefore,the correct option is $(C)$.

The passivity of iron in concentrated nitric acid is due to

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