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(A): Platinum and gold occur in native s...

(A): Platinum and gold occur in native state in nature.
(R): Platinum and gold are noble metals

A

Both A & R are true, R is the correct explanation of A

B

Both A & R are true, R is not correct explanation of A

C

A is true, R is false

D

A is false, R is true

Text Solution

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The correct Answer is:
A
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AAKASH SERIES-PRINCIPLES OF METALLURGY-OBJECTIVE EXERCISE-1
  1. (A): In aluminothermic process, Al reduction increases the heat of the...

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  2. (A) : Sulphide ores are concentrated by froth floatation process. (R...

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  3. (A): Platinum and gold occur in native state in nature. (R): Platinu...

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  4. (A): Graphite is an example of neutral refractory material used in fur...

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  5. Which of the following is true ?

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

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  7. Cassiterite ore is used to extract

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  8. The metal never found in free state is

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  9. Both calcination and roasting can be performed in

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  10. Copper pyrites ore is concentrated by

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

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

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

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

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

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

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

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

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

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

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