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Give the names of the four most abundant...

Give the names of the four most abundant elements in the earth's crust? Arrange them in decreasing abundance.

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` O (46*6 %) gt Si (27*7 %) gt Al (8*3%) gt iron (4*7%)`.
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PRADEEP-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS -ADDITIONAL QUESTIONS (Very Short Answer Questions)
  1. Why do some metals occur in the native state?

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  2. Why do metal sulphides occur mainly in rocks and metal halides in lake...

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  3. Give the names of the four most abundant elements in the earth's crust...

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  4. Name a sulphide ore of copper.

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  5. What is a mineral? How does it differ from an ore?

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  6. What is meant by benefaction process ?

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  7. What is gangue ?

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  8. What type of ores can be concentrated by magnetic separation method ...

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  9. Name a method used for removing gangue from sulphide ore.

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  10. (a) Why is it that only sulphide ores are concentrated by frot...

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  11. Write the name of the method of concentrated applied for the...

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  12. Out of PbS and PhCO 3 (ores of lead), which one is co...

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  13. Metal sulphides occur mainly in rocks and metal halides occur in lakes...

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  14. What is the role of collectors in froth floatation process ? G...

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

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  16. In the extraction of Al, impure alumina is dissolved in conc....

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  17. What is slag ? Give one example.

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  18. What type of ores are roasted?

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  19. What is meant by the term 'pyrometallurgy' ?

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

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