Question

1. Why gold and platinum does not loose their lustre?
2. Why copper is used for making electric wires and armature?
Which metalisused for making boiler and why?​

Answer 1

Answer:

Metals react with the atmosphere oxygen and the oxygen is bonded to them. after a layer of oxide forms over the surface, the metals lose their lustre. this does not happen in case of metals like Platinum and gold as it is difficult to oxidise them.Copper is used for making electrical wires that are used by your New Haven electrician due to its properties that make it an ideal metal for this purpose. ... Excellent Conductor of Electricity: Copper is an excellent conductor of electricity; no other metal can compete with it in terms of electrical conductivity.Materials. The pressure vessel of a boiler is usually made of steel (or alloy steel), or historically of wrought iron. Stainless steel, especially of the austenitic types, is not used in wetted parts of boilers due to corrosion and stress corrosion cracking.