(B) an alloy of tin and lead
Electric fuse wire is an alloy made of tin (63%) & lead (37%). The cross sectional area determines the melting point at a certain current. Alloys (e.g. tin/lead) are used due to their ‘eutectic’ action i.e. the resulting combination of good conductivity (due to the tin) with a low melting point due to the lead.
48. The most basic kind of soap is made from caustic soda and animal fat. The two are heated together and then cooled. The process is called "saponification". In
