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Which of the following reactions is an e...

Which of the following reactions is an example of auto reduction ?

A

`Fe_3O_4 +4CO rarr 3Fe+4CO_2`

B

`Cu_2O+C rarr 2Cu +CO`

C

`Cu^(2+)(aq) +Fe(s) rarr Cu(s) +Fe^(2+)(aq)`

D

`Cu_2O+1/2Cu_2S rarr 3Cu+1/2SO_2`

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The correct Answer is:
D
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MODERN PUBLICATION-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS -Multiple Choice Questions - Level - II
  1. The common depressant used in froth floatation process for separation ...

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  2. When copper ore is mixed with silica in a reverberatory furnace copper...

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  3. Which of the following reactions is an example of auto reduction ?

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  4. In the extraction of copper from its sulphide ore, the metal is formed...

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  5. Electrolytic refining is used to purify which of the following metal...

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  6. Extraction of gold and silver involves leaching the metal with CN^- io...

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  7. Coke is used in metallurgical process process chiefly as

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  8. Which of the following statement is not true ?

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  9. In the equation , 4M +8CN^(-) +2H2O+O2 rarr 4[M(CN)2]^(-)+4OH^(-), the...

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  10. Identify the reaction that does not take place in a blast furnace.

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  11. The temperature of the slag zone in the metallurgy of iron using blast...

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  12. Which of the following methods is used for obtaining aluminium metal ?

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  13. The metal used to recover copper from a solution of copper sulphate is

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  14. Which of the following pair of metals is purified by Van Arkel method ...

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  15. Duralumin is used in aircraft industry for its light weight and high s...

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  16. Which one of the following is true in electrolytic refining ?

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  17. In the extraction of copper from its sulphide ore, the metal is formed...

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  18. The reduction of zinc oxide with coke occurs at temperature

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  19. Identify the alloy containing a non - metal as a constituent in it.

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  20. Aluminium is extracted from alumina (Al2O3) by electrolysis of a molte...

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