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What is the role of limestone in the ext...

What is the role of limestone in the extraction of iron from its oxides?

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The role of limestone in the extraction of iron from its oxides is to remove silicate impurity of the ore as slag. It is also added as a flux.
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(i) Name the method of refining of metals such as Germanium. (ii) In the extraction of Al, impure Al_(2)O_(3) is dissolved in conc. NaOH to form sodium aluminate and leaving impurities behind. What is the name of this process? (iii) What is the role of coke in the extraction of iron from its oxides?

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Metals are extracted from their ores by a wide variety of techniques. The most common ores are oxides. Most metals are obtained by direct treatment of theirs ores with chemical agents, but the extraction of certain others require electrolysis. An example of the former type of process is the extraction of iron from its oxide, described by the following equation : Fe_(2) O_(3) + 3C rarr 2Fe + 3CO The relative ease of extraction of a metal from its oxide can be estimated using the Ellingham diagram, as shown in the figure. The diagram plots the free energies of formation of various oxides per mole of consumed oxygen as a function of absolute temperature. Which of the following best explains why the free energy of formation of Fe_(2)O_(3) becomes less negative as the temperature is increased.

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ICSE-SAMPLE QUESTION PAPER 3-QUESTION
  1. Name the method used for the refining of Nickel metal.

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  2. (a) Give an example of zone refining of metals. (b) What is the role ...

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  3. What is the role of limestone in the extraction of iron from its oxide...

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  4. Calculate E("cell") at 25^(@)C for the reaction : Zn+Cu^(2+) (0.2...

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  5. For the following cell, calculate the emf: Al//Al^(3+) (0.01 M)"||"...

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  7. A reaction is first order in A and second order in B (i) Write the d...

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  8. A reaction is first order in A and second order in B (i) Write the d...

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  9. (a) Explain the following terms : (i) Order of a reaction (ii) Mol...

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  10. (a) Draw the structures of the following : (i) PCl(5)(s) (ii) ...

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  11. Account for the follwing : (i) Bi(v) is a stronger oxidizing agent ...

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  12. Account for the follwing : (i) Bi(v) is a stronger oxidizing agent ...

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  14. Account for the following : (i) PCl(5) is more covalent than PCl(3)...

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  15. Account for the following : (i) PCl(5) is more covalent than PCl(3)...

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  16. Account for the following : (i) PCl(5) is more covalent than PCl(3)...

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  17. Write balanced chemical equations for the reaction: Chlorine is pa...

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