Question

(i) Indicate the principle behind the method used for the refining of zinc.
(ii) What is the role of silica in the extraction of copper?
(iii) Which from of the iron is the purest form of commercial iron?

Answer 1

(i) Zinc is a meal having low boiling point and it is refined by distillation method which is used for metals having low boiling points.
(ii) During extraction of copper, FeS or FeO is present as impurity, hence, $Si{O}_2$ is added as flux to form silicate (slag) which can be removed easily as it floats over molten copper (Cu).
(iii) Wrought iron is purest form of commercial iron.