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Write chemical reactions taking place in the extraction of zinc from zinc blende.

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The various steps involved are
a. Concentration: The ore is crushed and then concentrated by froth floation process.
b. Roasting: the concentrated ore is then roasted in presence of excess of air at about 1200 K when zinc oxide `(ZnO)` is formed.
`2ZnS+3O_2overset(1200K)to2ZnO+2SO_2`
c. Reduction: Zinc oxide obtained is mixed with powdered coke ad heated to 1673K in a fire clay retort when it is reduced to zinc metal.
`ZnOO+Coverset(1673K)toZn+CO`
At 1673K, zinc metal being volatile (b.p. 1180 K), distils over and is condensed.
dil. `H_2SO_4`. On passing electric current. pure Zn gets deposited on the cathode.
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CENGAGE CHEMISTRY ENGLISH-APPENDIX INORGANIC VOLUME 2-Exercises
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  2. Write down the reactions taking place in different zones in the blast ...

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  3. Write chemical reactions taking place in the extraction of zinc from z...

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  4. What is the function of SiO(2) in the metallurgy of copper?

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  5. Answer the Following: (i) What si the role of cryolite in the metall...

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

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  7. Describe a method for refining nickel.

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

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  9. Giving examples, differentiate between ‘roasting’ and ‘calcination’.

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  10. How is cast iron different from pig iron ?

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

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

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

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  14. What is the process of leaching in case of low grade copper ores ?

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

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  16. The value ofDelta (f) G^(Ө) for formation of Cr(2) O(3) is – 540 kJmo...

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

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

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  19. Name the processes from which chlorine is obtained as a by-product. Wh...

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  20. What is the role of graphite rod in the electrometallurgy of aluminium...

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