Explain why : Conc. nitric acid can be stored in aluminium containers.

1.	Explain why : Conc. nitric acid can be stored in aluminium containers.
Answer» Solution :Aluminium reacts with conc. `HNO_3` to FORM a very thin layer of aluminium oxide on its SURFACE which prevents it to react further with conc. HNO3. In other words, aluminium becomes passive by the action of conc. `HNO_3` `2AL(s)+ underset("(conc.)")(6HNO_3) to underset("Alumina")(Al_2 O_3 (s)) + 6 NO_2 (g) + 3H_2 O (L)` HENCE, aluminium containers can be used to transport conc. nitric acid.

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