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Question : 19
Total: 36
In column I different methods of extraction are given. Name the methods used for the extraction of metals given in Column II :
(b) Differentiate between roasting and calcination processes giving one example of each.
| Column-I | Column-II |
|---|---|
| (i) Reduction with carbon | Al, Zn, Na, Fe, Mn, Pb |
| (ii) Electrolytic reduction | |
| (iii) Reduction with aluminium |
Solution:
| Column-I | Column-II |
|---|---|
| (i) Reduction with carbon | |
| (ii) Electrolytic reduction | |
| (iii) Reduction with aluminium | |
| S.No. | Roasting | Calcination | ||||||
|---|---|---|---|---|---|---|---|---|
| 1. | Roasting is done in case of sulphide ores. | Calcination is done in case of carbonate ores. | ||||||
| 2 | In this, the ore is heated in the presence of excess air to convert it into its oxide compound. | The carbonate ore is heated in the absence of air (limited supply of air) to convert into its oxide. | ||||||
| 3 | The gas given out is Example: | The gas given out is Example: |
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