1.

(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»
CompositionReason for alloyingUse
(i) Brass: Cu -60 -80% Zn 40 - 20%Hard, lustrousElectrical fittings
(ii) Bronze : Cu -80% Zn-1%; Sn -19%Hard,attractionStatues,medals
(iii) Duralumin : Al-95% Mg -0.3% Cu =4%very light Aircrafts
(iv) Solder : pb -50% Sn -50%Low m.p,High tensile strengthwelding, electrical fase.
(v) Stainless : Fe -75% N -10%)
Steel : Cr -15%, C-5%		Lustrous,hardsurgical instruments.


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