Q130
General ScienceChemistry
Solder used for joining metal parts together is an alloy of
- a.Fe and Cu
- b.Fe and Zn
- c.Sn and Cu
- d.Sn and Pb
Answer: (D) Sn and Pb
Soft solder is an alloy of tin (Sn) and lead (Pb) - typically about 60:40 - with a low melting point (around $183^{\circ}C$ to $190^{\circ}C$), which is why it is used to join electrical and metal parts; lead-free solders (tin with silver and copper) are now preferred in electronics. Tin + copper is bronze, copper + zinc is brass, and copper + zinc + nickel is German silver. Stainless steel is iron with chromium, nickel and carbon. Other alloys: duralumin (Al, Cu, Mg, Mn), gun metal (Cu, Sn, Zn), type metal (Pb, Sb, Sn).