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What is the significance of leaching in ...

What is the significance of leaching in the extraction of aluminium?

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Aluminium ix extracted by the electrolysis of pure molten alumina `(Al_2O_3). Pure alumina is obtained from bauxite by leaching the ore with concentrated solution of NaOH. Then almina present in bauxite will go into solution as sodium aluminate The insoluble impurities are filtered off. Hydrated alumina is then precipitated by passing `CO_2` through the solution. The precipitate is filtered and strongly heated to form pure alumina.
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A N EXCEL PUBLICATION-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS-QUESTION BANK
  1. Which of the following equations can't be obtained by the dimensional ...

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  2. What is the significance of leaching in the extraction of aluminium?

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  3. Metallrgical process can be explained in terms of thermodynamic princi...

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  4. Why is reduction of a metal oxide easier if the metal formed is in liq...

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  5. Is it ture under certain conditions Mg can reduce Al2O3 and Al can red...

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  6. Analyses the table given below: Which of the ores mentioned in the ...

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  7. Identify the ores that can be concentrated by leaching.

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  8. What do you mean by leaching?

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  9. You are provided with samples of some impure metals such as titanium a...

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  10. What is the name of the method that is used in manufacturing of sodium...

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  11. The concept of DeltaG^@ of coupled reaction are used explain reduction...

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  12. In the blast furnace for manufacturing iron, most of the reduction is ...

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  13. Bauxite, Al2O3.xH2O is an important ore of aluminium. It is concentrat...

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

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  15. Carbonate ores are usually subjected to calcination, while sulphide or...

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  16. Match the items of Column I with items of Column II

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  17. Why is reduction of a metal oxide easier if the metal formed is in liq...

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  18. The scientific and technological process used for isolation of the met...

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  19. The concept of DeltaG^@ of coupled reaction are used explain reduction...

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  20. Give two examples for alloy

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