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

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Name the principal ore of aluminium. Explain the significance of leaching in the extraction of aluminium.

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PRADEEP-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS -IMPORTANT QUESTIONS FOR BOARD EXAMINATION
  1. Name a sulphide ore which is not concentrated by froth floatati...

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  2. A sample of galena is contaminated with zinc blende. Name one chemical...

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

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  4. Why is it advantageous to roast a sulphide ore to the oxide before red...

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  5. Giving examples differentiate between roasting and calcination.

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  6. Suggest a condition unders which magnesium could reduce alumina.

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  7. How is cas iron different from pig iron ?

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  8. The choice of a reducing agent in a particular case depends on thermod...

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  9. The extraction of Au by leaching with NaCN both oxidation and reductio...

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  10. (a) During roasting most of the metals are converted into their ...

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  11. What is the principle of thermite process ? Name two meals which can ...

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  12. Write a non - exothermic reaction takind place in the blast fur...

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  13. Write down the reactions taking place in Blast furnace related t...

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  14. What is a slag ? Give one example.

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  15. How is copper extracted from a low grade ore of it ?

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  16. Which of the following metals cannot be extracted by the smelt...

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

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  18. Both iron and aluminium combine slowly with oxygen at room temperature...

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

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  20. Suggest one method for separation of nickel form cobalt ?

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