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Why is the extraction of coppper from py...

Why is the extraction of coppper from pyrites more difficult than that from its oxide ore through reduction?

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The Gibbs energies of formation of most sulphides are greater than that for .CS_2.. In fact, .CS. is an endothermic compound. Hence it is a common practice to rodst sulphide ores to corresponding oxides prior to reduction.
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V PUBLICATION-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS-QUESTION BANK
  1. Copper can be extracted by hydrometallurgy but not zinc. Explain.

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  2. What is the role of depressant in froth floatation process?

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  3. Why is the extraction of coppper from pyrites more difficult than that...

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  4. Explain: i) Zone refining ii)Column chromatography

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  5. Out of C and CO, which is a better reducing agent at 673K?

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  6. Name the common elements present in the anode mud in electrolytic refi...

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  7. Write down the reactions taking place in different zones in the blast...

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  8. Write chemical reactions taking place in the extraction of zinc from z...

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  9. State the role of silica in the metallugy of copper.

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  10. What is meant by the term,' Chromatography' ?

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  11. What criterion is followed for the selection of the stationary phase i...

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  12. Describe a method for refining nickel.

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  13. How can you separate alumina from silica in a bauxite ore associated w...

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  14. Giving examples, differentiate between 'roasting' and 'calcination'.

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  15. How is 'cast iron ' different from 'pig iron'?

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  16. All ores are minerals, but all minerals are not ores. Why?

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  17. Why copper matte is put in silica lined converter?

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  18. Alumina is mixed with cryolite and subjected to electrolysis to extrac...

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  19. How is leaching carried out in case of low grade copper ores?

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  20. Why is zinc not extracted from zinc oxide through reduction using CO?

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