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Calcination is the peccess of heating th...

Calcination is the peccess of heating the ore

A

in inert gas

B

in the presence of air

C

in the absence of air

D

in the presence of CaO and MgO

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The correct Answer is:
C
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AAKASH SERIES-METALLURGY-EXERCISE - 7.2
  1. Calcination is the peccess of heating the ore

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  2. Metal sulphides occur mainly in rocks, but metal halides occur in lake...

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  3. Roasting of the sulphide ore is partially done in the metallurgical op...

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  4. Egg shells on treating with dilute mineral acids give brisk effervence...

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  5. What criterion is followed for the selection of the stationary phase i...

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  6. Which metals are extracted by auto-reduction process?

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  7. Why copper pyrites roasted partially during the extraction of copper?

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  8. Ag and Cu are below hydrogen in activity series, yet they are found in...

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  9. CO is more effective reducing agent than coke below 983 K, but above 9...

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  10. How the following metals are refined: (a) Copper with cuprous oxide ...

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  11. When heamatite is burnt in air with coke and lime at 2000^(@)C, steel ...

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  12. Why is the extraction of copper form pyries more difficult then that f...

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  13. How is leaching carried out in the case of low grade copper ores?

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  14. Hydrogen is a common reductant of organic chemicals, but it is not ...

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  15. Copper can be extracted by hydrometallurgy but not Zinc -explain.

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  16. Alkali metals are

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  17. Is it true that under certain conditions, Mg can reduce SiO2 and Si c...

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  18. Name the metal M, which is extracted based on the following equation ...

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  19. In the extraction of Fe, what is the advantage of difference in temper...

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  20. Metal oxide is easily reduced if the metal is in molten state at the t...

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  21. What are the compositions of gem stones, ruby and sapphire?

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