Question

‌Which‌ ‌alloy‌ ‌is‌ ‌used‌ ‌for‌ ‌soldering‌ ‌of‌ ‌electric‌ ‌wire?‌ ‌
(A)$$Sn‌ ‌+‌ ‌Cu$$‌ ‌
(B)$$Al$$‌ ‌
(C)$$Pb‌ ‌+‌ ‌Sn$$‌ ‌
(D)$$Cu‌ ‌+‌ ‌Zn$$‌ ‌

Answer 1

Hint:Alloy is defined as the combination of two or more metals. The elements which are good conductors of heat have high melting points so that the temperature can be raised. They should not have the tendency to oxidize at high temperatures but should be able to have high resistance. This type of alloy is used in hair dryers.

Complete answer:The process of formation of alloy improves the properties of metal by making them stronger enough and to be corrosion resistant. The alloy of bronze and tin is used to make bells, wrenches. We choose the alloy mixture rather than pure metal in electrical heating devices because the resistivity of alloy is more in comparison to pure metal. The solder is defined as a filler that creates the strong bond between the metal workpieces. It is made up by the low melting points metals. Lead is a chemical element which is represented by the symbol of Pb and has the atomic number of$$82$$ . It is a soft metal which exists the property of malleability. It has a low melting point which is equal to about $${327.5^o}$$C. Whereas tin is also a chemical element which is represented by the symbol of Sn and whose atomic number is$$50$$ . The melting point of tin is low, equal to about $${231.97^o}$$C. The melting point of the substance is generally dependent on pressure which is usually specified at a standard pressure like$$1$$ atm or one atmospheric temperature. A solder is also an alloy which has a low melting point. The two metals belonging to the $${14^{th}}$$group form alloy solder. The solder is made up of tin and lead majorly. Silver is also present in it with less amount.

So the correct option is option (C).

Note:The working of the heating elements depends on the heating effect of electric current. The soldering process is different from welding. In the process of welding the workpieces are melted and then joined but in soldering they are not melted. The filler which is used in soldering should have low melting point then the workpieces.