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Explain why zinc oxide can be reduced to...

Explain why zinc oxide can be reduced to metal by heating with carbon and not with `Cr_(2)O_(3)`.

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DINESH PUBLICATION-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS -Assignment
  1. Name the principle ore of aluminium. How is the metal extracted from t...

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  2. What is the role of NaCN in the extraction of silver from silver ore ?

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  3. Explain why zinc oxide can be reduced to metal by heating with carbon ...

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  4. How is copper metal extracted from its sulphide ore ?

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  5. What is flux ? Give one example each of acidic and basic flux.

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  6. Why do some metals occur in the native rate ?

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  7. Define calcination.

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  8. State briefly the principles which serve as basis for the following op...

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  9. Give definitions of following along with examples. (a) Calcination ...

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

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  11. What role does cryolite play in Hall Harnoult process ?

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  12. Distinguish between the following : (a) Ores and minerals (b) Flux a...

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  13. Name two important ores of iron.

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  14. Write the method of extraction of iron and the chemical reactions invo...

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  15. Name a method used to remove gangue impurity from sulphide.

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  16. How is wrought iron different from steel ?

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  17. Which reducing agents are employed to get copper from the leached low ...

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  18. What is the role of zinc metal in the extraction of silver ?

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  19. What is the role of NaCN in the extraction of gold ? (ii) What is co...

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  20. (i) Mention the principle behind the zone refining of metals. (ii) W...

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