1. What is the role of graphite in the electrometallurgy of aluminium?
2. Describe the principle involved in each of the following processes.
1. Monds process for refining of Nickel.
2. Column chromatography for purification of rare elements.
3. Describe the following:
1. The role of cryolite in electro-metallurgy of aluminium.
2. The role of carbon monoxide in the refining of crude nickel.
4. (a) Which solution is used for the leaching of silver metal in the presence of air in the metallurgy of silver?
(b) Out of ‘C’ and ‘CO’, which is a better reducing agent at the lower temperature range in the blast furnace to extract iron from the oxide ore?
5. (a) Give an example of zone refining of metals.
(b) What is the role of cryolite in the metallurgy of aluminum?
1. Outline the principles behind the refining of metals by the following methods:
(i) Zone refining method
(ii) Chromatographic method.
2. Write the principle behind the following methods of refining:
(i) Hydraulic washing
(ii) Vapour-phase refining
3. (i) Name the method of refining of nickel.
(ii) What is the role of cryolite in the extraction of aluminium?
(iii) What is the role of limestone in the extraction of iron from its oxides?
4. Describe the principle behind each of the following processes:
1. Vapour phase refining of a metal.
2. Electrolytic refining of a metal
3. Recovery of silver after silver ore was leached with NaCN.
5. Explain the role of each the following in the extraction of metals from their ores:
(i) CO in the extraction of nickel.
(ii) Zinc in the extraction of silver.
(iii) Silica in the extraction of copper.