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Which of the following reaction occur du...

Which of the following reaction occur during calcination ?

A

`CaCO_(3) rarr CaO +CO_(2)`

B

`2FeS_(2) +(11)/(2)O_(2) rarr Fe_(2)O_(3) +4SO_(2)`

C

`AI_(2)O_(3)xH_(2)O rarr AI_(2)O_(3) + xH_(2)O`

D

`ZnS +(3)/(2) O_(2) rarr ZnO +SO_(2)`

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ALLEN-METALLURGY-EXERCISE -04
  1. Common impurities present in bauxite are …….

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  2. Which of the following ore are concentrated by froth floatation ?

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  3. Which of the following reaction occur during calcination ?

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  4. For the meallurgical process of which of the ores calcined ore can be ...

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  5. The main reaction occuring in blast furnance during extraction of iron...

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  6. In which of the following method of purification, metal is converted t...

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  7. Which of the following statements are correct?

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  8. Extraction of chlorine from brine is based on

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  9. Why is an external emf of more than 2.2 V required for the extracation...

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  10. At temperature above 1073K, coke can be used to reduce FeO to Fe. How ...

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  11. Impurities of sulphur, silicon and phosphorus can be removed from cast...

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  12. How is copper extracted from low grade copper ores ?

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  13. Write two basic requirements for refining of a metal by Mond's process...

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  14. Although carbon and hydrogen are better reducing agents but they are n...

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  15. How do we separate two sulphide ores by froth floatation method ? Expl...

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  16. The purest form of iron is prepared by oxidising impurities from cast ...

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  17. The mixture of compounds A and B is passed through a column of Al(2)O(...

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  18. Why is sulphide ore of copper heated in a furnance after mixing with ...

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  19. Sulphdies ores are converted to oxides before reduction . This is expl...

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  20. Which method is used for refining Zr and Ti ? Explain with equation.

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