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By Chander, Jagdish; Kumar, Anil

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Cu + 2C~ ~ (CH3COO)2CU + H 20 4) Action of alkalies. Although alkalies have no action on copper, aqueous ammonia in presence of air dissolves the metal with the formation of the complex ion, tetramine copper (II). Cu + H 20 + 11202 ~ Cu2+ + 20H-] x 2 Cu2+ + 4NH3 ~ [Cu(NH3)4F+ x 2 Overall reaction Cu + 2H20 + 02 + BNH3 ~ 2[Cu(NH3)4F+ + 40H 5) Action with non-metals. Copper when heated with chlorine and sulphur forms the corresponding cupric salt. Cu + Cl2 ~ CuCl2 cupric chloride Cu+S~ CuS . cupric sulphide 6) Metal displacement.

For example steel is an alloy of iron and carbon. Similarly German silver is an alloy of copper, zinc and Tin. An alloy is thus solid mixture of two or more different elements having the following characteristics i) Atleast one element must be a metal ii) The components are intimately mixed. iii) Metallic characteristics are retained or improved after alloying. Purpose of Alloying - The purpose of making alloy is to get the desired performance of the constituent elements in given service conditions at economical rates.

11. Stainless steel is a 12. Flux is a substance used to remove infusible impurities in the form of _ _ _ _ ' 13. Electromagnetic separation method is used when either the ore or the impurities are in nature. 14. In the froth floatation process ore particles are preferentially wetted by _ _ __ while the gangue particular are wetted by _ _ __ IS. Oxide and carbonate ores are usually concentrated by _ _ __ Ans. 1. Fe, 2. specific gravities, 3. electropositive, 4. acidic, 5. Cu 2 S 7. gangue, 8. OXljgen, 9.

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