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Name two metals which are available in t...

Name two metals which are available in the free state in nature.

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Gold (Au), platinum (Pt)
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CHHAYA PUBLICATION-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS-EXERCISE (VERY SHORT ANSWER-TYPE QUESTIONS)
  1. Name the ore of aluminimum that is generally used for its extraction.

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  2. What are 'tough pitch' and 'spelter'?

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  3. Name two metals which are available in the free state in nature.

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  4. Give an example of a mineral which is not an ore.

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  5. What is white bauxite and red bauxite?

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  6. Name the metals that are usually extracted by electrolytic reduction. ...

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

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

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

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

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  11. What is '18-8' steel?

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

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  13. What is cupellation?

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

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

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

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  17. Name two metals which are purified by liquation.

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

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  19. What are the constituents of copper matte?

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  20. Name two metals which are purified by chromatography.

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