Q23 of 400 Page 191

Why does a new aluminium vessel lose shine so soon after use?

A new aluminium vessel lose shine so soon after use due to the corrosion of aluminium metal when exposed to moist air. This happens because the oxygen of air reacts with aluminium to form a thin, dull layer of aluminium oxide all over the vessel.

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21 Silver metal does not combine easily with oxygen but silver jewellery tarnishes after some time. How? 22 Write the composition of the alloy called bronze. Give two uses of bronze. 24 Why do gold ornaments look new even after several years of use? 25 Name two metals which are highly resistant to corrosion.