Q44 of 400 Page 192

What is meant by the 'concentration of ore'?

Before extracting metal from an ore, it is necessary to remove these impurities (gangue) from it. By removing the gangue, we get a concentrated ore containing a much higher percentage of metal. This is called concentration of ore; also known as enrichment of ore.

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43 What is meant by refining of a metal ? Name the most widely used method for the refining of impure metals obtained by various reduction processes. Describe this method with the help of a labelled diagram by taking the example of any metal. 44 Define the terms (i) mineral (ii) ore, and (iii) gangue. 44 Name one ore of copper (other than cuprite). Which compound of copper is present in this ore? Also, write its chemical formula. 45 Explain how, a reduction reaction of aluminium can be used for welding cracked machine parts of iron.

Write a chemical equation for the reaction involved.