Metals react with oxygen, sulphur compounds, carbon dioxide and moisture to
form layers of their oxides, hydroxides, carbonates or sulphides.
This process is called corrosion. Due to this process, their surface
becomes dull. (1)
(b) Dilute nitric acid is an oxidising acid and hence oxidises
formed into ,
so zinc does not evolve with dilute . (1)
(c) Sulphides are insoluble in water but metal halides are
water soluble. Therefore, metal sulphides occur in rocks but halides in sea and
lake water. (1)
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