Question

(i) composition (ii) reason for alloying (iii) one use of each of the following alloys. 

1. Brass 

2. Bronze 

3. Duralumin 

4. Solder [fuse metal] 

5. Stainless steel

Answer 1

Composition	Reason for alloying	Use
(i) Brass: Cu -60 -80% Zn 40 - 20%	Hard, lustrous	Electrical fittings
(ii) Bronze : Cu -80% Zn-1%; Sn -19%	Hard,attraction	Statues,medals
(iii) Duralumin : Al-95% Mg -0.3% Cu =4%	very light	Aircrafts
(iv) Solder : pb -50% Sn -50%	Low m.p,High tensile strength	welding, electrical fase.
(v) Stainless : Fe -75% N -10%) Steel : Cr -15%, C-5%	Lustrous,hard	surgical instruments.