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Concentrated nitric acid can be transpor...

Concentrated nitric acid can be transported in vessels of aluminium or tin cans. Why ?

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Aluminium and Sn is passive to concentrated nitric acid.
When Al or Sn vessel is filled with con. `HNO_(3)`, a protective oxide film of `Al_(2)O_(3)` or `Sn_(2)O_(3)` is formed.
This film prevents further reactions of acid with metal. Hence `HNO_(3)` can be transported in either aluminium or Sn cans.
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