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What is polling ?...

What is polling ?

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USHA PUBLICATION-GENERL PRINCIPAL AND PROCESS OF ISOLATION OF ELEMENTS-EXERCISE
  1. Copper can be extracted by hydrometallurgy but not zinc. Explain.

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  2. Describe the principle of van-Arkel process for refining of metal.

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  3. Name three ores which can be purified by froth floatation process. Wha...

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  4. Name one chief ore of iron and aluminium. Name the methods used for th...

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  5. Explain the electrolytic refining of a metal.

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  6. How is zinc extracted from its sulphide ore ?

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  7. How is zinc dust and granulated zine prepared from zinc metal ?

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  8. The process used for purification of bauxite ore containing high silic...

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  9. What is the role of lime stone in the extraction of iron ?

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  10. How can you get wrought iron from cast iron ?

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  11. What is polling ?

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  12. What do you mean by autoreduction in metallurgy?

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  13. What is thermite welding ?

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  14. What is the role of silica in the metallurgy of copper?

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

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  16. Describe Mond process for refining of nickel

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  17. What is the role of depressant in froth flotation process ?

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  18. Out of C and CO, which is a better reducing agent at 673 K?

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  19. What is flux ?

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  20. Out of 'C' and CO which is a better reducing agent for FeO ?

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