Many pure metals like copper, iron and gold are very soft and as such are considered unsuitable for certain uses. Metallic objects around us such as cooking utensils, statues, ornaments, guns etc. are actually not made up of pure metals. Instead of pure metals, alloys are used in the design of most of the useful objects. Making alloys enhances the basic properties of a metal which is the primary constituent (metal) of an alloy. (I) How does electrical conductivity and melting point of a metal change when it is converted to its alloy by mixing a small amount of an element in it? (II) Name an alloy used for welding two wires together in an electric circuit. Write its major constituents. (III) (a) What are alloys? How is 'Brass' (an alloy) prepared? OR (III) (b) What is stainless steel? How is it prepared? Write one important property which makes it more useful in making cooking utensils as compared to its primary metal.