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Describe the principle of extraction of ...

Describe the principle of extraction of each of the following :
(a) `Sn` from `SnO_(2)`
(b) `Zn` from `ZnO`
( c) `Cr` from `Cr_(2) O_(3)`.

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(i) `Sn` from `SnO_(2)` : `SnO_(2)` is crushed, concentrared, roasted, and washed. It is smelted with powdered anthracite in blast furnace to obtain tin.
`SnO_(2) + 2e^(Ө) rarr Sn + 2CO`
(ii) `Zn` from `ZnO` : Zinc oxide is mixed with powdered coke and heated to `1673 K` in a fire day retort when it is reduced to zinc metal.
`ZnO +C overset(1673 K)rarrZn + CO`
(iii) `Cr` from `Cr_(2) O_(3)` : `Cr` is obtained from `Cr_(2)O_(3)` byaluminothermy process. In this process, a mixture of aluminium powder and `Cr_(2)O_(3)` is ignited in a closed crucible by inserting a burning magnesium ribbon into the ignition mixture consisting of magnesium power and barium peroxide.
`2Al + Cr_(2)O_(3) rarr Al_(2)O_(3) + 2Cr`.
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CENGAGE CHEMISTRY ENGLISH-GENERAL PRINCIPLES AND PROCESS OF ISOLATION OF ELEMENTS-Exs 1.1 (Subjective)
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  2. The choice of a reducing agent in a particular case depends on thermod...

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  3. Which is a better reducing agent at 710^@ C : C or CO ?

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  4. Indicate the temperature at which carbon can be used as a reducing age...

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  5. Is it true that under certain conditions, Mg can reduce SiO(2), and S...

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  6. Giving appropriate examples (at least three), explain how the reactivi...

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  7. Alkali metals cannot be extracted by reduction of their oxides and oth...

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  8. Outline the principles of refining of metals by the following methods:...

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  9. Predict the modes of occurrence of the following three types of metals...

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  10. How do non-metals occur in nature ? How are they extracted//isolated f...

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  11. Name the chief ores of tin, iron and aluminium. What methods are emplo...

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  12. Name three ores which are concentrated by froth flotation process. Wha...

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  13. What is the thermodynamic consideration in the choice of a reducing ag...

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  14. Carbon monoxide is more effective reducing agent than carbon below 983...

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  15. Describe the principle of extraction of each of the following : (a) ...

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  16. Which metals are generally extracted by the electrolytic processes ? W...

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  17. Name the main steel plants which are operated by the Steel Authority o...

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  18. Name the metals which are associated with the following terms in their...

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  19. What do you understand by the following terms ? (a) Roasting (b) C...

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  20. Which method would you suggest for the separation of the metals in the...

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