Which are the materials generally employed as solder in soldering operations in electronics? 

(a) Iron and tin (b) Lead and tin (c) Aluminium and lead (d) Aluminium and iron 

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1 Answers

(b) Solder is a fusible metal alloy with a melting point or melting range of 90 to 450 degree Celsius (190 to 840 °F), used in a process called soldering where it is melted to join metallic surfaces. It is especially useful in electronics and plumbing. Solder is an alloy of lead and tin.

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