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Which of the following reduction reactio...

Which of the following reduction reactions are actually employed in commercial extraction of metals ?

A

`Fe_2O_3 + 2Al to Al_2O_3 + 2Fe`

B

`Cr_2O_3 + 2Al to Al_2O_3 + 2Cr`

C

`2Na[Au(CN)_2] + Zn to Na_2[Zn(CN)_4 ] + 2Au`

D

`Cu_2S + Pb to Cu + PbS downarrow `

Text Solution

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The correct Answer is:
B, C
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MOTION-METALLURGY-EXERCISE 2 (LEVEL - II)
  1. Metals which can be extracted by smelting process are :

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  2. the common impurities present in bauxite are

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  3. Which of the following reduction reactions are actually employed in co...

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  4. Which of the following cannot be obtained by electrolytic reduction of...

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  5. Which of the following ores are concentarted by froth floatation?

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  6. Which of the following statement(s) is/are common between roasting and...

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  7. Which of the following reaction(s) occurs during calcination?

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  8. Roasting can be performed in:

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  9. Which of the following is(are) sulphide ores?

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  10. Which of the following is(are) regarded as iron ores?

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  11. Which of the following employ downward movement or ore due to gravity?

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  12. Calcium silicate slag formed in extraction of iron

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  13. Amphoteric nature of aluminium is employed in which of the following p...

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  14. Noble metal(s) which are commerically extracted by cyanide process is(...

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  15. Carbon reduction method is commercially employed for commercial extrac...

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  16. The main reaction occuring in blast furnace during the extraction of i...

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  17. Which of the following are true for electrolytic extraction of alumini...

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  18. During extraction of copper, it is obtained in the form of molten matt...

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  19. Which of the following ores is(are) concentrated industrially by froth...

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  20. Which of the following is true for calcination of a metal ore ?

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