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Metal sulphides occur mainly in rocks an...

Metal sulphides occur mainly in rocks and metal halides occur in lakes and seas. Give reason.
(b) Pine oil is used in froth flatation process. Why ?
( c) What is a depresent ? Give an example.
(d) What is the role of stabiliser in froth flotation process ?
( e) What is gangue ?

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Chemical compounds like cresols and aniline which tend to stabilize the froth are called froth stabilizers.
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PRADEEP-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS -ADDITIONAL QUESTIONS (Very Short Answer Questions)
  1. Write the name of the method of concentrated applied for the...

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

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

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

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

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

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  7. What is slag ? Give one example.

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  8. What type of ores are roasted?

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

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

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  11. What is the role of coke in the extraction of iron from its ...

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  12. Name the reducing agent to obtain iron from Fe2 O 3 at hi...

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

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  14. Which form of the iron is the purest form of commercial iron ?

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  15. What is the role of silica in the extraction of copper?

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  16. What is the composition of 'Copper matte'?

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  17. How is copper extracted from low grade copper ores?

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  18. Which reducing agent is employed to get copper from the leached low-gr...

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  19. Write the overall reaction taking place in the process used for ...

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  20. How are tin and lead purified ?

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