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Why is the extraction of copper from pyr...

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

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Sulphide ore of copper `(Cu_(2)S)` cannot be directly reduced by either coke or hydrogen because `Delta_(f)G^(@) " of " Cu_(2)O` is more than those of `CS_(2)` and `H_(2)S` that will be formed as a result of the reaction.
These reactions are therefore, not feasible. However the `Delta_(f)G^(@) " of " Cu_(2)SO` is lower than that of `CO_(2)`. Therefore, the sulphide ore is first roasted to `Cu_(2)O` which is then reduced.
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DINESH PUBLICATION-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS -N.C.E.R.T. Exercise
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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 copper 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 down the chemical reactions taking place in the extraction of zi...

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  9. State the role of silica in the metallurgy 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 selectrion of the stationary phase ...

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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 cas iron different from pig iron ?

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

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  17. What is the role of cryolite in the metallurgy of aluminium?

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

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

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  20. The value ofDelta (f) G^(Ө) for formation of Cr(2) O(3) is – 540 kJmo...

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