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.

AcademicChemistryNCERTClass 10

Correct Answer: (d) zinc is more reactive than tin 
Explanation: Zinc has higher reactivity than tin. Tin interacts only with extremely strong acids. Zinc, on the other hand, reacts with simple acids found in food. As a result, food cans are coated with a less reactive metal like tin to avoid food poisoning. 

[Extra information: Reactivity series is the series of arrangement in a vertical column in decreasing order of their reactivities.
Rancidity: It is the aerial oxidation of fats and oils in foods followed by unpleasant smell and taste is called rancidity.

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.]

Updated on 10-Oct-2022 12:46:54