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Name some elements that can occur free i...

Name some elements that can occur free in nature

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`H_(2)`, `O_(2)`, `N_(2)`, `He`, `Ne`, `Ar`, `Kr`, `Xe`, `Pt`, `Au`, etc.
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AAKASH INSTITUTE-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS-Try Yourself
  1. Match the following from column I to column II {:("Column I" , "Colu...

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  2. Bname the vitamin that contains metal in it. Name the metal also

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  3. Name some elements that can occur free in nature

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  4. Define the term flux.

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  5. Discuss the use of an acidic flux in metallurgy.

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  6. Name and formula of two magnetic ores.

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  7. Which types of ores are purified by hydraulic washing ? Give two examp...

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  8. Which chemical is most commonly used as collector in froth floatation ...

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  9. Why are sulphide ores converted to oxide form before reduction to meta...

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  10. Discuss the process of roasting with suitable example.

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  11. During roasting the temperature should be kept below its m.p. Why ?

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  12. What type of the reduction method does the following reaction show (Be...

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  13. Which reducing agent is commonly employed for reduction of (a) ZnO "...

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  14. In some cases, Ellingham diagrams (graphs) show a bend. What do you re...

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  15. On Ellingham diagrams if two graphs intersect each other, what does th...

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  16. Name the four man zones of blast furnace in the extraction of Fe from ...

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  17. Write the complete set of reactions occuring in the zone of reduction ...

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  18. Coke can be used to reduce Cu(2)O. Explain it based on thermodynamic v...

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  19. What the impure copper collected from Bessemer converter commonly call...

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  20. Name the formulate themain ore from which zinc is extracted.

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