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Giving examples, differentiate between '...

Giving examples, differentiate between 'roasting' and 'calcination'.

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Roasting is the process of converting .dn ore into metallic oxide by heating strongly in excess of air: 2 ZnS+3 O_2 rarr 2 ZnO+2 SO_2(~g) Calcination is the process of converting an ore into its oxide by.heating it strongly. in absence of tim¡ted supply of air. 2 Zn CO_3(~s) rarr 2 ZnO(s)+2 CO_2(~g)
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V PUBLICATION-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS-QUESTION BANK
  1. Describe a method for refining nickel.

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  2. How can you separate alumina from silica in a bauxite ore associated w...

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  3. Giving examples, differentiate between 'roasting' and 'calcination'.

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  4. How is 'cast iron ' different from 'pig iron'?

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  5. All ores are minerals, but all minerals are not ores. Why?

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  6. Why copper matte is put in silica lined converter?

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  7. Alumina is mixed with cryolite and subjected to electrolysis to extrac...

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

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  9. Why is zinc not extracted from zinc oxide through reduction using CO?

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  10. The value of Deltar G for formation of Cr2 O3 is -540 kJmol^-1 and th...

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  11. Out of C and CO, which is a better reducing agent for ZnO?

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  12. The choice of a reducing agent in a particular case depends on thermod...

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  13. Name the process from which chlorine is obtained as a by-product.What...

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  14. What is the role of graphite rod in the electrometallugy of aluminium?

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  15. Outline the principles of refining of metals by the following methods....

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  16. Predict conditions under which Al might be expected to reduce MgO

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  17. All ores are minerals, but all minerals are not ores.Is this statement...

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  18. Explain the term gangue,flux and slag.

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  19. An oxide ore A has a magnetic oxide B and SiO2 as the chief impur...

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  20. Suggest methods for concentration of the following ores?1.ZnS 2.Fe2 O...

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