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An ore of galena (PbS) is contaminated w...

An ore of galena (PbS) is contaminated with Zinc blende (ZnS). Name one chemical which can be used to concentrate galena selectively by froth floatation process.

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The correct Answer is:
`NaCN` ( sodium cyanide ) is used as depressant .
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MODERN PUBLICATION-GENERAL PRINCIPLE OF ISOLATION OF ELEMENTS-EXERCISE
  1. The highest oxidation state of transition metal is what ?

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  2. The highest oxidation state of transition metal is what ?

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  3. An ore of galena (PbS) is contaminated with Zinc blende (ZnS). Name on...

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  4. Name two ores of zinc

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  5. what is the name of purest form of iron

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  6. Name the purification process to get 100 % pure aluminium metal.

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  7. What is the role of stabilizer in froth floatation process ?

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  8. Although carbon and hydrogen are better reducing agents but they are n...

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  9. A mixture of compounds A and B is passed through a column of Al(2)O(3)...

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  10. Why is zinc and not copper used for the recovery of metallic silver fr...

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  11. Why is partial roasting of sulphide ore done in metallurgy of copper ?

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  12. What happens when potassium iodide is added to CuSO4 solution ?

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  13. Cast iron is harder than pure iron . Why ?

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  14. Calculate the oxidation number of chromium in K2Cr2O7.

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  15. Explain why CuSO4 is blue while ZnSO4 is white.

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  16. What is flux? Give an example.

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  17. What is calcination?

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  18. What is electro-refining ? Give one example .

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  19. Distinguish between flux and slag ?

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  20. What is the function of limestone the extraction of iron? Give equatio...

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