Question

A coating of zinc is deposited on iron to protect it from _________________.
A) Rain
B) Corrosion
C) Sun
D) None of these

Answer 1

Hint: Since Zinc is more reactive than the iron, the coated surface of zinc on iron or steel reacts with oxygen in the atmosphere to form a layer. Galvanization plays an important role to protect metals like iron and steel.

Complete step by step answer:
The process of applying a protective layer of zinc in steel or iron to prevent it from rusting is known as galvanization.
Galvanization protects the iron and steel by forming a coat of corrosion resistant zinc which prevents the corrosive nature substance to reach the delicate part of the steel or iron. Also zinc acts as a sacrificial anode so that if coating of zinc is scratched then the exposed part of steel or iron to air will be protected by the remaining zinc layer. Since Zinc is more reactive than iron, the coated surface of zinc on iron or steel reacts with oxygen in the atmosphere to form a layer of zinc oxide which protects the zinc surface from further moisture reaction and attacks and hence they protect iron from rusting.
Therefore a coating of zinc is deposited on iron to protect it from rusting and corrosion of it.
Hence the correct answer is option B.

Note: Common method of galvanization is hot dip galvanization. In this process parts of metals are put into the bath of molten zinc to form a layer of zinc.