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From the following flowsheet for the ext...

From the following flowsheet for the extraction of pure metal, answer the given questions.

(vi) following reaction is not involved intermite process :

A

`3Mn_(3)O_(4) +8Al rarr 9Mn + 4Al_(2)O_(3)`

B

`Cr_(2)O_(3) +2Al rarr Al_(2)O_(3) + 2Cr`

C

`2Fe +Al_(2)O_(3) rarr 2Al + Fe_(2)O_(3)`

D

`B_(2)O_(3) +2Al rarr 2B +Al_(2) O_(3)`

Text Solution

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The correct Answer is:
C
In themite welding
`Fe_(2)O_(3)(s) +2AI(s) overset(Delta)underset(Mg)rarr Fe(l) +AI_(2)O_(3) (l)`
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ALLEN-METALLURGY-EXERCISE-02
  1. Neutral refractory material used in furnaces is :

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  2. Carbon cannot be used in the reduction of Al(2)O(3) because :

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  3. From the following flowsheet for the extraction of pure metal, answer ...

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  4. Of the following reduction processes, correct processes are :

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  5. Consider the following steps: Cu(2)S overset("roast in air")rarr A o...

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  6. Main source of lead is galena (PbS). It is converted to Pb by : S...

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  7. Ag(2)S + NaCN rarr (A),(A) + Zn rarr (B) (B) is a metal. Hence, (A) ...

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  8. The elemental phosphorus is made from rock phosphate, Ca(3)(PO(4))(2) ...

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  9. A: Bauxite is purified by leaching process R: Aluminium oxide reacts ...

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  10. The process which do use catalysts are

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  11. Metallury involves steps :

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  12. Which of the following metals is obtained by electrolytic reduction pr...

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  13. Which of the following ore is/are oxide ore (s) ?

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  14. Which of the following are correctly matched?

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  15. In which of the following pair(s) the minerals are converted in to m...

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  16. Tin stone (cassiterite) is purified by magnetic seperation method .Na...

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  17. The reaction (s) which does (do) not occur in the reduction zone in ...

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  18. Which of the following statements(s) is (are) true?

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  19. The major role of flourspar (CaF(2)), which is added in small quantiti...

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  20. Which of the followgin are correctly matched?

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