Aluminium containers are frequently used to transport trioxonitrate (v) acid because
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Aluminium containers are frequently used to transport trioxonitrate (v) acid because aluminium
A. has a low-density
B. does not react with the acid
C. does not corrode
D. has a silvery – white appearance
When aluminum comes in contact with concentrated nitric acid, a brief reaction occurs to form a protective oxide of aluminum Al₂O₃, this oxide which does not react with the acid protects the original metal from corrosion.
Now for the right answer to the above question:
- Option A is incorrect. the density of aluminum is irrelevant.
- Option B is incorrect. Aluminum actually reacts with the acid to form aluminum oxide which prevents further reaction.
- C is correct. aluminum, on exposure to the acid briefly forms an oxide that prevents corrosion.
- D is not the correct answer. The physical appearance of aluminum is irrelevant to its resistance to corrosion.
You may please note these/this:
- Aluminum actually reacts with the acid, but aluminum oxide formed from this reaction does not react with the acid.
- Other metals do not form this kind of protective layer, as their oxides could further react with the acid.
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/ culled from 2015 JAMB-UTME Chemistry past question 36 /