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Why do metal sulphides occur mainly in r...

Why do metal sulphides occur mainly in rocks and metal halides in lakes and seas?

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Metal halides being soluble in water, get dissolved in rain water and are carried to lakes and seas during weathering of rocks. On the other hand, metal sulphides being insoluble are left behind in the rocks as residue.
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Why do some metals occur in the native rate ?

PRADEEP-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS -ADDITIONAL QUESTIONS (Very Short Answer Questions)
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  2. Why do metal sulphides occur mainly in rocks and metal halides in lake...

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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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