Alloy formation gives rise to:
A. decrease in corrosion
B. increase in hardness
C. decrease in conductivity
D. all are correct

Hint: As we know that alloy is a mixture of metals with other elements that are having a metallic bonding character. It is found that alloys of varying components and compositions are formed because these desirable properties are not available in the pure metal.

Complete Solution :
- It is found that alloy formation gives rise to decrease in conductivity.
- It is found that alloy formation gives rise to decrease in corrosion:
It is found that alloys are more resistant to corrosion than that of the pure metals. When the metals are in pure form these are chemically reactive and can be easily corroded by the moisture as well as by the atmospheric gases. It is seen that alloying a metal helps in increasing the inertness of the metal. This process will increase the corrosion resistance.
- It is found that alloy formation gives rise to increase in hardness: Basically, an alloy is found to be harder than that of its constituents. As we know that pure metals are soft, and the hardness of the metal is basically increased by alloying it with another nonmetal or metal.
So, the correct answer is “Option D”.

Note: - As we know that all metals are used as alloys, this is because these are having the properties superior to pure metals. The process of alloying is done for many reasons, mainly to increase corrosion resistance, increase strength.