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Solder, the alloy commonly used for joining metal pieces, is composed of which pair of metals?

1. Cu and Pb
2. Zn and Cu
3. Pb and Sn
4. Fe and Zn

Correct answer: Pb and Sn

Solution

Solder is an alloy of lead and tin (commonly around 50% Pb and 50% Sn), valued for its low melting point.

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