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Which kind of ores undergo self reductio...

Which kind of ores undergo self reduction ?

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Sulfide ores of less electropositive metals.
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Main ore of lead is gaalena.This is mined and separated from other minerals by froth flotation.There are two methods of extracting the lead. (i)First method involves the roasting of ore followed by reduction with coke or CO. (ii)Second method involves the partial roasting of ore followed by self reduction. In self reduction process, the species which bring about the reduction is :

Main ore of lead is galena.This is mined and separated from other minerals by froth flotation.There are two methods of extracting the lead. (i)First method involves the roasting of ore followed by reduction with coke or CO. (ii)Second method involves the partial roasting of ore followed by self reduction. Partial roasting of galena gives :

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Main ore of lead is gaalena.This is mined and separated from other minerals by froth flotation.There are two methods of extracting the lead. (i)First method involves the roasting of ore followed by reduction with coke or CO. (ii)Second method involves the partial roasting of ore followed by self reduction. Which of the following statement is incorrect about the extraction of lead from galena ?

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ICSE-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS -EXERCISE (PART-II ( DESCRIPTIVE QUESTIONS )) (VERY SHORT ANSWER QUESTIONS)
  1. In terms of Ellingham diagram state why Al2O3 cannot be reduced by chr...

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  2. Which reducing agent is used to reduce the oxides of less electroposit...

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  3. Which kind of ores undergo self reduction ?

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  4. What are refractory materials?

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  5. Why is MgO used for lining the inner surface of the furnace?

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

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  7. How would you purify a metal like Copper?

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  8. Name the purification method which involves vapour phase extraction.

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  9. Ultra pure silicon is needed by electronic industry. By which method o...

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  10. Name the three main varieties of iron. Which out of them is the purest...

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  11. What is the percentage of carbon in steel?

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  12. A crude metal is heated with iodine to form metal tetraiodide which is...

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  13. What is the principle of chromatographic separation ?

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  14. Name the most important ore of aluminium.

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  15. When bauxite ore contains considerable amount of silica as an impurity...

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  16. Name two alloys of aluminium and give their composition.

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  17. What is the composition of ignition mixture used in aluminothermy?

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  18. Which process is used to convert pure alumina into aluminium.

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  19. Why cryolite is mixed with alumina during its electrolysis?

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  20. What is the purpose of adding a small amount of CaF2 to alumina during...

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