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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) and (R) are true and (R) is the correct explanation of (A)

B

Both (A) and (R) are true and (R) is not the correct explanation of (A)

C

(A) is true but (R) is false

D

Both (A) and (R) are false

Text Solution

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The correct Answer is:
A
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AAKASH SERIES-PRINCIPLES OF METALLURGY-Objective exercise -4 (Assertion (A) & Reason (R) type questions :
  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) Levigation is used for the separation of oxide ores from impuriti...

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  5. (A) Calamine is a mineral of calcium (R) Calamine is chemically a s...

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  6. Carnallite is an example of

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  7. (A) Froath floatation process involves adsorption (R) Pure ore is p...

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  8. (A) Wolframite impurities are separated from cassiterite by electrom...

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  9. (A) In smelting, roasted ore is heated with powdered coke in presenc...

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  10. (A) Leaching is the process of converting the ore into oxide and the...

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  11. (A) Aluminium metal is used as a reducing agent in thermite welding ...

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  12. (A) Lead, tin and bismuth are purified by liquation method . (R) Lead...

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  13. (A) Pin oil is fused as a foaming agent in froth floatation process ...

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  14. (A) Aluminium metal can be extracted by the electrolysis of aqueous al...

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  15. (A) Magnesium can not be extracted by electrolysis of aqueous salt s...

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  16. (A) Iron metal is refined in blast furnace (R) Blast furnace is used...

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  17. (A) Van Arkel method is a vapour phase refining process (R) Vapours...

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  18. (A) For iron extraction usually Fe(2) O(3) is used but not FeS(2) ...

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  19. (A) In the case of an ore contaning ZnS and PbS, the one depresant lik...

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  20. (A) In Froth floatation proess collectors like pine oil is added (R)...

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