In which of the following does aluminum becom | vedclass

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(D) Aluminum becomes passive in concentrated oxidizing acids because it forms a thin,protective,non-porous layer of oxide $(Al_2O_3)$ on its surface.

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All of these

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(D) Aluminum becomes passive in concentrated oxidizing acids because it forms a thin,protective,non-porous layer of oxide $(Al_2O_3)$ on its surface. This layer prevents further reaction of the metal with the acid. Concentrated $HNO_3$,$H_2CrO_4$,and $HClO_4$ are all strong oxidizing agents that cause this passivation.

In which of the following does aluminum become passive?

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