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Why does roasting of cinnabar HgS, produ...

Why does roasting of cinnabar HgS, produce the metal, mercury, rather than an oxide of mercury?

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`HgS rarr HgO rarr Hg`. Since Hg lies much below H in electrochemical series, HgO is further reduced to Hg
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CHHAYA PUBLICATION-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS-EXERCISE (VERY SHORT ANSWER-TYPE QUESTIONS)
  1. Name the metals that are usually extracted by electrolytic reduction. ...

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  2. Name the reducing agent that is used in the thermite process?

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  3. Why does roasting of cinnabar HgS, produce the metal, mercury, rather ...

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  4. Name the method of purification that produces metals of very high puri...

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  5. Name the method used to obtain pure copper from blister copper?

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  6. What is '18-8' steel?

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  7. How is carbon found to be present in wrought iron?

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  8. What is cupellation?

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  9. Name two sulphide ores which can be separated by froth-floatation.

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  10. Give an example each of an acidic and a basic flux.

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  11. How can a small amount of cadmium be removed from zinc?

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  12. Name two metals which are purified by liquation.

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  13. Which of the following ores cannot be concentrated by electromagnetic ...

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  14. What are the constituents of copper matte?

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  15. Name two metals which are purified by chromatography.

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  16. What happens when the sulphide ore of mercury is subjected to roasting...

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  17. Name the alloy of aluminium that is used for making aeroplanes.

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  18. Name the method used for purifying metals like zirconium and titanium?

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  19. Name the alloy used in making ball bearings.

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  20. Explain why metals do not exist as nitrate salt in nature.

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