Write down the reactions taking place in different Zones in the blast furnance during the extraction of Iron.
Describe a method for refining nickel.
Nickel is refined by Mond's process. Nickel when heated in a stream of carbon monoxide forms volatile nickel carbonyl Ni(CO)4. The carbonyl vapour when subjected to still higher temperature undergoes thermal decomposition giving pure metal.
How can you separate alumina from silica in a baxuite ore associated with silica? Give equations, if any.
Name the processes from which chlorine is obtained as a bye-product. What will happen if an aqueous solution of NaCl is subjected to electrolysis?
Outline the principles of refining of metals by the following methods:
(i) Zone refining.
(ii) Electrolytic refining.
(iii) Vapour phase refining.