Question

why do surface of aluminium vessel acquire a dull appearance when exposed to air​

Answer 1

Explanation:

Aluminium react with oxygen present in air to form a dull layer of aluminiumoxide on the surface of the aluminum vessel due to which vessels acquire a dull appearance

Answer 2

Answer:

Explanation:

Aluminium vessel when exposed to air,will react with the oxygen in the atmosphere and form a thin layed of aluminium oxide on the vessel,

These layer of aluminium oxide on the vessel results in the dull appereance ,