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Suggest a condition under which magnesiu...

Suggest a condition under which magnesium could reduce alumina.

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The two equations are :
`(4)/3 Al+O_2rarr2/3Al_2O_3` (b) `2Mg+O_2rarr2MgO`
At the point of intersection of the `Al_2O_3` and MgO curves (marked ''A'' in diagram 6.4) , the `DeltaG^@` becomes ZERO for the the reaction.
`2/3Al_2O_3+2Mgrarr2MgO+4/3Al`
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NCERT TELUGU-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS-Exercises
  1. Suggest a condition under which magnesium could reduce alumina.

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

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  3. What is the role of depressant in froth floatation?

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

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  5. Explain Zone refining.

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  6. Between C and CO, which is a better reducing agent at 673K.

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  7. Name the common elements present in the anode mud in the eletrolytic r...

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  8. Write down the chemical reactions taking place in different zones in t...

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  9. Write down the chemical reactions taking place in the extraction of zi...

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  10. State the role of silica in the metallurgy of copper.

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  11. What is meant by the term “chromatography”?

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

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  13. Decribe a method for the refining of nickel.

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  14. How is alumina separated from silica in the bauxite ore associated wit...

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  15. Explain roasting and calcination.

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  16. How is cast iron different from pig iron?

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  17. Differentiate between “minerals” and “ores”.

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

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  19. What is the role of cryolite in the metallurgy of aluminium?

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

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

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