Solder is a metallic alloy
yes
It is a mixture
A metallic compound uses its sea of electrons, which are delocalized throughout the compound, to have higher ductility.
Neither. It is classified as a compound.
Solder comes in various sorts - lead-free, brass, silver, and probably others.
Iron is not a compound, it is a metallic element.
Gypsum is a salt (a compound made of both metallic and non-metallic elements).
it is not metallic SO2 is a non-metallic compound
either metallic compound.element.ionic compound.covalent compound.
Chlorine is a nonmetal but its is an element, not a compound.
soldering
that would be a metallic compound.