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Extraction of gold and silver involves l...

Extraction of gold and silver involves leaching the metal with `CN^(-)` ion. The metal is recovered by…..

A

displacement of metal by some other metal from the complex ion.

B

roasting of metal complex

C

calcination followed by roasting

D

thermal decomposition of metal complex

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ALLEN-METALLURGY-EXERCISE -04
  1. In the metallurgy of aluminium

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  2. Electrolytic refining is used to purify which of the following metals ...

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  3. Extraction of gold and silver involves leaching the metal with CN^(-) ...

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  4. Choose the correct option of temperature at which carbon reduces FeO t...

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  5. Below point 'A' FeO can (a)be reduced by carbon monoxide only. (b)...

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  6. For the reduction of FeO at the temperature corresponding to point D, ...

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  7. Which of the following options are correct ?

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  8. In the extraction of aluminium by Hall-heroult Process, purified Al(2)...

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  9. Which of the following statements is correct about the role of collect...

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  10. In the froth floatation process, zinc sulphide and lead sulphide can b...

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  11. Common impurities present in bauxite are …….

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  12. Which of the following ore are concentrated by froth floatation ?

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  13. Which of the following reaction occur during calcination ?

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  14. For the meallurgical process of which of the ores calcined ore can be ...

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  15. The main reaction occuring in blast furnance during extraction of iron...

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  16. In which of the following method of purification, metal is converted t...

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  17. Which of the following statements are correct?

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  18. Extraction of chlorine from brine is based on

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  19. Why is an external emf of more than 2.2 V required for the extracation...

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  20. At temperature above 1073K, coke can be used to reduce FeO to Fe. How ...

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