Question

Galvanisation is a method of protecting iron from rusting, by coating with a thin layer of:
A) Gallium
B) Aluminium
C) Zinc
D) Silver

Answer 1

Hint: In order to answer this question, you must recall the concept of galvanisation and rusting of iron and its prevention. Just go through the process of galvanisation and you will get your required answer. And select the correct option.


Complete answer:
Step 1:Galvanization is a process used for the protection of steel or iron from rusting. In this process, a protective zinc coating is applied on the iron surface.
The most common method of galvanizing is to hot dip the metal in a bath of molten zinc. Zinc $(Zn)$ is more reactive metal than iron, hence it reacts with oxygen to form a protective oxide layer, which prevents inner iron from getting in contact with oxygen.
Step 2: Prevention of rusting of iron:As we know that, when Iron is exposed to air and moisture, it gets rapidly rusted and rusting can be prevented by coating iron with a thin layer of zinc $(Zn)$ . This process of coating iron and steel with a coating of zinc is called galvanisation.
Clearly, we can conclude that Galvanisation is a method of protecting iron from rusting, by coating with a thin layer of Zinc.

Hence the correct answer is option C.


Note:Rusting of iron refers to the formation of rust, a mixture of iron oxides, on the surface of iron objects or structures. This rust is formed from a redox reaction between oxygen and iron in an environment containing water (such as air containing high levels of moisture). The rusting of iron is characterized by the formation of a layer of a red, flaky substance that easily crumbles into a powder.