important topics in general principles and processes of isolation of elements

Yes your friend gave a proper list of important topics, you may refer to his answer. However, I would suggest you to go through NCERT intext and exercise questions as they are frequently asked in board exams. 

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general principle of isolation of elements is studied in four vast topics

  1. Crushing And Grinding of Ore
  2. Metods of Concentration of Elements
  • hydrolic washing
  • Magneyic Separtion
  • Froth floation
  • leaching

3. Oxidation of purified(concentrated) ore

  • calcination
  • Roasting

4. Reduction of metal oxide into metal

  • Direct reduction
  • Reduction with the help of reducing agent(Ellingham Diagram)
  • Electrolysis

5. Purification

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