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Write the chemical reaction involved in the extraction of gold by cyanide process. Also give the role of zinc in the extraction.

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PRADEEP-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS -NCERT EXEMPLAR PROBLEMS WITH ANSWERS, HINTS AND SOLUTIONS (MULTIPLE CHOICE QUESTIONS - II )
  1. In which of the following method of purification metal is converted to...

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  2. Which of the following statements are correct ?

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  3. In the extraction of chlorine from brine

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  4. At temperature above 1073K coke can be used to reduce FeO to Fe. How c...

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  5. Wrought iron is the purest form of iron. Write a reaction used for the...

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  6. How is copper extracted from low grade copper ores?

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  7. Write two basic requirements for refining of a metal by Mond process a...

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  8. Although carbon and hydrogen are better reducing agents but they are n...

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  9. How do we separate two sulphide ores by Froth Floatation Method? Expla...

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  10. The purest form of iron is prepared by oxidising impurities from cast ...

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  11. The mixture of compounds A and B is passed through a column of Al(2)O(...

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  12. Why is sulphide ore of copper heated in a furnace afer mixing with sil...

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  13. Why are sulphide ores converted to oxide before reduction?

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  14. Which method is used for refining Zr and Ti? Explain with equation.

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  15. What should be the considerations during the extraction of metals by e...

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  16. What is the role of flux in metallurgical processes?

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  17. How are metals used as semiconductor refined? What is the principle of...

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  18. Write down the reactions taking place in Bast furnace related to the m...

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  19. Give two requirements for vapour phase refining.

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  20. Write the chemical reaction involved in the extraction of gold by cyan...

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