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Give reason : Reduction of Cr(2) O(3) wi...

Give reason : Reduction of `Cr_(2) O_(3)` with `Al` is thermodynamically feasible, yet it does no occur at room temperature.

A

Smelting

B

Roasting

C

Calcination

D

Aluminothermic process

Text Solution

Verified by Experts

The correct Answer is:
D
Reduction with `AI` known as Aluminothermite process/Gold-smith thermite process.
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ALLEN-METALLURGY-EXERCISE-02
  1. NaCN used in the froth floatation method for the purification of ore...

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  2. Which of the following metals cannot be extracted by the smelting proc...

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  3. Give reason : Reduction of Cr(2) O(3) with Al is thermodynamically fea...

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  4. Which metal is leached from its ore by the use of KCN

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  5. Name the flux to remove the impurity of SiO(2)

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  6. Mercury containers are made of

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  7. Auto-reduction process is used for the extraction of :

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  8. When Alumina is electrolysed in presence of cryolite, the gas liberate...

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  9. In the extraction of copper, metal is formed in the Bessemer converter...

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  10. x,y and z in the following processes are respectively (i) P(2)O(5) +...

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  11. Which of the following processes involves smelting

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  12. Out of the following which ores are calcinated during extraction (a)...

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  13. Which of the following match are incorrect

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  14. Malachite on calcination gives rarr 'A' + CO(2) +H(2)O. Compound 'A'...

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  15. Which of the following ores are calcinared during extraction

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  16. Which process of purification is represented by the following reaction...

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  17. Which are correctly is matched

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  18. Which of the following reactions is not involved in serpeck's process ...

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  19. Impure Ni + 4CO overset(60-80^(@)C)to Ni(CO)(4)overset(180^(@)C)to Ni+...

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  20. Neutral refractory material used in furnaces is :

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