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Consider the following statements : Ro...

Consider the following statements :
Roasting is carried out to :
1. Convert sulphide into oxide
2. Melt the ore
3. Remove moisture, water of hydration and expel organic matter
4. Remove sulphur and arsenic in the form of volatile oxides
Out of these statements :

A

(i),(ii) and (iii) are correct

B

(i) and (iv) are correct

C

(i),(ii) and (iv) are correct

D

(ii),(iii) and (iv) are correct

Text Solution

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The correct Answer is:
C
Melting of ore is performed in blast furnace during smelting
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ALLEN-METALLURGY-EXERCISE-01
  1. Which of the following metals are extracted by using Al as reducing ag...

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  2. The correct ste of carbonate ores is (a) Magnesite (b) Siderite (c) ...

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  3. Calcination is the process of heating the ore strongly in the of air.

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  4. Copper matte consists of:-

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  5. Which of the following statements is correct for roasting

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  6. Among the following statements, the incorrect one is

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  7. Fe can displace which of the following ions from their aqueous solutio...

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  8. There are following extraction process of silver but not :

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  9. Which of the following is not an ore:

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  10. In the Pidgeon process, Mg is produced by:

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  11. Fool's gold is

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  12. Which one of the following reactions is an example for calcination pro...

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  13. Identify the process to which the following reaction belongs Al(2) O...

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  14. (Ag +Pb) alloy overset("Melt and add zinc")rarr (Ag +Pb +Zn) "melt" ov...

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  15. Formation of metallic copper from sulphide ore in te normal thermometa...

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  16. Bessemerisation is carried out for (i) Fe (ii) Cu (iii) AI (iv) sil...

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  17. Consider the following statements : Roasting is carried out to : 1...

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  18. For extraction of sodium from NaCI, the electrolytic mixture NaCI + Na...

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  19. Among the following statements the incorrect one is:

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  20. Pb and Sn are extracted from their chief ore respectively by

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