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Food cans are coated with tin and not with zinc because
(a) zinc is costlier than tin
(b) zinc has a higher melting point than tin
(c) zinc is less reactive than tin
(d) zinc is more reactive than tin.
Rancidity spoils the food materials prepared in fats and oils which have been kept for a considerable time and makes them unfit for eating. Rancidity can be prevented by adding anti-oxidants to foods containing fats and oils.
Corrosion is a natural process of gradual deterioration and loss of a material (usually a metal) due to chemical, electrochemical and other reactions (mainly oxidation) of the exposed material surface with the surrounding environment. Even the ambient air, full of moisture and oxygen, can start this process, known as rusting, on iron surfaces.
It converts a refined metal into a more chemically stable form such as oxide, hydroxide, or sulfide, whenever a gas or liquid chemically attacks an exposed surface and is accelerated by warm temperatures and by acids and salts.]
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