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The extraction of Au by leaching with Na...

The extraction of `Au` by leaching with `NaCN` both oxidation and reduction. Justify giving equations.

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`4Au + 8NaCN +O_(2) +2H_(2)O to 4 Na [Au (CN)_(2)] +4NaOH`
In this reaction , Au is oxidised to `Au ^(+) " ions ," O_(2)` is reduced to `OH^(-)` ions.
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DINESH PUBLICATION-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS -Questions From Board Examinations
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  2. The extraction of Au by leaching with NaCN both oxidation and reductio...

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  3. What is the role of following ? (a) Depressant in the froth floatati...

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  6. Explain the role of cryolite in the electrolytic reduction of alumina.

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  7. Why can zinc oxide be reduced to the metal by heating with carbon and ...

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  8. Why is the extraction of copper from pyrites more difficult than that ...

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  9. State briefly the principles which serve as the basis for the followin...

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  10. What is the role of iodine in the refining of titanium ?

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  11. Describe the role of NaCN in the extraction of gold from gold ore.

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  12. What is the role of iodine in the refining of zirconium (Zr) ?

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  13. How is zinc oxide converted into metallic zinc ?

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  14. Outline the principle of the method used for refining of (a) Nickel ...

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  15. Differentiate between mineral and ore.

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  16. Describe the principle controlling the extraction of cast iron from pi...

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  17. Describe the principle behind the recovery of silver ore leached with ...

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  18. What happens when : (i)Cu(2)O undergoes self reduction in a silica l...

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  19. (a) What role does cryolite play in Hall Harnoult process ? (b) How ...

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  20. Give one example each of (i) acidic flux (ii) basic flux.

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