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Alkali metals cannot be extracted by red...

Alkali metals cannot be extracted by reduction of their oxides and other compounds because

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(i) Copper (from copper pyrites, `CuFeS_(2))`
(ii) Lead (from Galena, `PbS`)
(iii) Zinc (from Zinc blende, `ZnS`).
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CENGAGE CHEMISTRY ENGLISH-GENERAL PRINCIPLES AND PROCESS OF ISOLATION OF ELEMENTS-Exs 1.1 (Subjective)
  1. Discuss some of the factors which need consideration before deciding o...

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

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  3. Which is a better reducing agent at 710^@ C : C or CO ?

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  4. Indicate the temperature at which carbon can be used as a reducing age...

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  5. Is it true that under certain conditions, Mg can reduce SiO(2), and S...

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  6. Giving appropriate examples (at least three), explain how the reactivi...

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  7. Alkali metals cannot be extracted by reduction of their oxides and oth...

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  8. Outline the principles of refining of metals by the following methods:...

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  9. Predict the modes of occurrence of the following three types of metals...

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  10. How do non-metals occur in nature ? How are they extracted//isolated f...

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  11. Name the chief ores of tin, iron and aluminium. What methods are emplo...

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  12. Name three ores which are concentrated by froth flotation process. Wha...

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  13. What is the thermodynamic consideration in the choice of a reducing ag...

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  14. Carbon monoxide is more effective reducing agent than carbon below 983...

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  15. Describe the principle of extraction of each of the following : (a) ...

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  16. Which metals are generally extracted by the electrolytic processes ? W...

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  17. Name the main steel plants which are operated by the Steel Authority o...

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  18. Name the metals which are associated with the following terms in their...

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  19. What do you understand by the following terms ? (a) Roasting (b) C...

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  20. Which method would you suggest for the separation of the metals in the...

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