A) 70% lead, 30% tin
B) 30% lead, 70% tin
C) 80% lead, 20% tin
D) 90% copper, 10% tin
Correct Answer: B
Solution :
Solder is an alloy of tin and lead (\[Sn\,=67%\] and lead \[=33%\]). It has got low melting point and is used as fuse wire and for welding in electrical circuits etc.
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