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NaCN is sometimes added in the froth flo...

NaCN is sometimes added in the froth floatation process as a depressant, when ZnS and PbS mineral are extracted because

A

`Pb(CN)_2` gets precipitated without any effect on `ZnS`

B

`ZnS` forms Q soluble complex `Na_2 [Zn(CN)_4]` while `PbS` forms the froth

C

`PbS` forms soluble complex `Na_2[ Pb(CN)_4]` while `ZnS` forms froth

D

`Zn(CN)_2 `precipitated without affecting `PbS`

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SHARAM PUBLICATION-GENERAL PRINCIPLES AND PROCESS OF ISOLATION OF ELEMENTS-EXERCISE
  1. In the froth floatation process of concentration of ores, the ore part...

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  2. What is the function of potassium ethyl xanthate in froth floatation p...

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  3. NaCN is sometimes added in the froth floatation process as a depressan...

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  4. Which of the following metals can be extracted by smelting?

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  5. The process in which metal oxide is reduced to metal is called

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  6. The most abundant element in the earth's crust (by weight) is :

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  7. The main function of roasting is :

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  8. An ore after levigation is found to have acidic impurities. Which of t...

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  9. When limestone is heated, carbon dioxide is given off. This operation ...

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  10. Delta G^@ - T plot in Ellingham 's diagram slopes are downward for the...

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  11. Which of the following pairs of metals is purified by Van Arkel metho...

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  12. Identify an alloy containing a non- metal as a constituent in it.

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  13. During electrolyte refining of copper some metals present as impurity ...

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  14. According to Ellingham diagram, the oxidation reaction of carbon to ca...

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  15. Which of the following reaction is an example of calcination process ?

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  16. What is benefaction of ore ?

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  17. Name one important ore and alloy copper.

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  18. How slag is formed in metal extraction ?

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  19. What is mean by pyrometallurgy ?

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  20. Name three alloys of Copper

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