Discussion
The principal material used in soldering are:
Answer: C
The principal materials of solder are tin and lead.
Traditional soft solder is a tin-lead alloy, typically 60/40 or 63/37 tin to lead, which melts at about 183 °C to 190 °C, low enough to join electrical connections and sheet metal without melting the parts. Lead-free solders now replace the lead with small amounts of copper, silver or bismuth, but tin remains the main metal.
Copper is the metal usually being soldered, not the solder, and zinc-lead and tin-copper pairs are not the classic soldering alloy.
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