The method of zone refining of metals is based on the principle of
Greater solubility of the impurity in the molten state than in the solid
The method of zone refining of metals is based on the principle of greater solubility of the impurity in the molten state than in the solid. Elements which are used as semiconductors like Si, Ge, Ga etc are refined by this method.
When copper pyrites is roasted in excess of air, a mixture of CuO + FeO is formed. FeO is present as impurities. This can be removed as slag during reduction of CuO. The flux added to form slag is
The temperature of the slag zone in the metallurgy of iron using blast furnace is
The ore that is concentrated by froth floatation process is
Native silver metal forms a water soluble complex with a dilute aqueous solution of NaCN in the presence of
Which of the following factors is of no significance for roasting sulphide ores to the oxidexs and not subjecting the sulphide ores to carbon reduction directly?
Extraction for zinc from zinc blende is achieved by
Which one of the following ores is best concentrated by froth-floatation method?
The mass of carbon anode consumed (giving only carbon dioxide) in the production of 270 kg of aluminium metal from bauxite by the Hall process is (Atomic mass of Al = 27)