(a) Name the method used for removing gangue from sulphide ores.
(b) How is wrought iron different from steel?

Explanation

(a) This method is known as Froth-floating method.
(b) Wrought iron and steel may seem similar on the surface, but these two metal alloys posses diffe.rent raw materials, properties and industrial and decorative applications. Wrought iron is the purest form of commerciol iren. It contains about0.2-0.5% carbon besides traces of P and Si tin the form of slag. When wrought iron is heated with 0.5% carbon it gives steel. Hence steel is less pure than corought iron.