Question

Corrosion can be prevented by
A. Alloying
B. Tinning
C. Galvanizing
D. All of the above

Answer 1

Hint: Corrosion slowly coats the surfaces of the metallic objects with oxides or other salts of the metals. Rusting of iron, tarnishing of silver, development of green coating on a copper vessel are examples of corrosion.

Complete step by step answer:
-Alloying: An alloy is a mixture of a metal with another element or metal. Alloying the surface of metal prevents rust from developing and combination of metal may reduce the overall cost of the material.
-Tinning: Tin is a soft, malleable and silver coloured metal. It is used to coat other metal surfaces and make alloys. Tin is not reactive to acidic foods and it is not allergenic, doesn't rust and can prevent any kind of corrosion. It is also used to coat steel that is used for cooking clutter, to help prevent them rusting.
-Galvanizing: Galvanization is the process of applying the coating of zinc to iron and steel surfaces to prevent the rusting of iron. It is one of the most widely used processes to prevent rusting.
All the above conditions are used to prevent corrosion and therefore all options are correct.
So, the correct answer is option d) All of the above.

Note: In corrosion, metal is oxidized by the loss of electrons to oxygen to form oxides. Corrosion of iron is known as rusting and it occurs in the presence of water and air. It causes enormous damage to buildings, bridges, ships and all the objects made especially of iron. We lose crores of rupees every year due to corrosion. The chemistry of corrosion is quite complex but it may be considered as an essential part of electrochemistry.