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Which of the following is not found in n...

Which of the following is not found in native state ?

A

Pt

B

Cu

C

Au

D

Na

Text Solution

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The correct Answer is:
D
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AAKASH SERIES-PRINCIPLES OF METALLURGY-OBJECTIVE EXERCISE-1
  1. (A): Graphite is an example of neutral refractory material used in fur...

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  2. Which of the following is true ?

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  3. Which of the following is not found in native state ?

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  4. Cassiterite ore is used to extract

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  5. The metal never found in free state is

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  6. Both calcination and roasting can be performed in

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  7. Copper pyrites ore is concentrated by

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  8. Which one of the following is not a method of concentration of ore

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  9. Most abundant element in the earth's crust by weight is

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  10. The rocky and silicious matter associated with an ore is called

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  11. The process of removing of lighter ganse particles by washing in a cur...

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  12. In the froth flotation process for the purification of minerals the pa...

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  13. Froth floatation process for the concentration of ores is an illustrat...

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  14. Gravity separation process may be used for the concentration of

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  15. Wolframite (FeWO(4)) is separated from cassiterite by

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  16. In the extraction of gold ,alluival sand is conectrated by whic...

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  17. Which one of the following is used as conditioner in froth flotation p...

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  18. During extraction of a metal the ore is roasted if it is a

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  19. A common metal that is used for the extraction of some metals from the...

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  20. Extraction of metals from sulphide cres is done by

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