Name an alloy of
(i) Aluminium used in construction of air crafts.
(ii) Lead in joining metals for electric welding.
(iii) Copper used in household vessels.

Explanation

(i) The alloy is duralumin : `Al (95%), Cu (4%), Mg (0.5%), Mn (0.5%)`.
(ii) The alloy is solder : `Pb (50%), Sn (50%)`
(iii) The alloy is brass : `Cu (80%), Zn (20%)`.