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

Explanation

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.