Question

Which alloy is used to solder the electric wires?
(A) Copper and Zinc
(B) Aluminium and Magnesium
(C) Lead and Tin
(D) Copper and Tin

Answer 1

Hint: In the above question, it is asked which alloy is used to solder the electric wires. Solder is an alloy which is used for this soldering purpose. So, we have to find the composition of solder. The metals must possess suitable electrical properties as well as strength.

Complete answer:
Solder is a fusible metal alloy which is used to create a permanent bond between metal work pieces. Solder is melted in order to adhere to and connect the pieces after cooling. Hence, the component of an alloy that is suitable for use as solder must have a lower melting point than the pieces being joined. The solder should also be resistant to oxidative and corrosive effects that would degrade the joint over time. Solder used in making electrical connections also needs to have favourable electrical characteristics.
Lead is inexpensive and has all the suitable properties needed for soldering. Tin is the usual main structural metal of the alloy. It has good strength and wetting. Hence, they are the main components of solder with little percentage of other elements.
Hence, we can say that lead and tin are used to solder the electric wires. So, the correct option is option C.

Note:
The solidifying behaviour depends on the alloy composition. Pure metals solidify at a certain temperature, forming crystals of one phase. Eutectic alloys also solidify at a single temperature, all components precipitating simultaneously in so-called coupled growth. So, we have to be very practical while choosing the elements.