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Which of the following processes involve...

Which of the following processes involve the roasting process ?

A

`ZnCO_(3) to ZnO + CO_(2)`

B

`Fe_(2)O_(3) + 3C to 2Fe + 3CO`

C

`2PbS + 3O_(2) to 2PbO + 2SO_(2)`

D

`Al_(2)O_(3).2H_(2)O to Al_(2)O_(3) + 2H_(2) O`

Text Solution

Verified by Experts

The correct Answer is:
C
Roasting involves heating the ore strongly in presence of excess of air `(O_(2))`.
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CENGAGE CHEMISTRY-GENERAL PRINCIPLES AND PROCESS OF ISOLATION OF ELEMENTS-Exercise (Single Correcttype)
  1. Which of the following metals can be extracted by smelting ?

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  2. The most abundant element in earth's crust is

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  3. Which of the following processes involve the roasting process ?

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  4. Alklali metals do not exist in free state in nature because these are

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  5. In the froth flotation process for benefication of ore, the ore partic...

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  6. Salt which is (are) least likely to find in minerals

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  7. Which of the following benefication processes is used for the mineral ...

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  8. In the aluminothermite process, aluminium is

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  9. Magnetic separation is used for increasing concentration of the follow...

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  10. Which of the following srtatement above the advantage of masting of su...

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  11. When the sample of copper with zinc impurityn is to be purified by ele...

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  12. During the process of electroytic refining of copper some metals prese...

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  13. On heating a mixture of Cu(2)O and Cu(2)S, we get :

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  14. Sulphide ore of metal are usually concentrated by froth flotation proc...

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  15. Heating of ore in presence of air to remove sulphure impurities is cal...

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  16. The method of zone relining of metal is based on the principle of AIFM...

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  17. Which of the following function is of no significance for roasting su...

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  18. Complex formation for cyanide method is used for the extraction of

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  19. The least stable oxide at room temperature is

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  20. High purity copper metal is obtained by

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