11. How much range of sintering temperature (°C) is generally used for Zinc sulphate
12. In Bayer Process, how much % of the gibbsite is converted into aluminum oxide
13. Ores of copper are
14. Which of the following is a suitable method to remove hydrogen from molten Aluminium?
15. For electrorefining of Al which statement is correct
16. Determine the correctness or otherwise of the following
Assertion: For the extraction of metal values from their sulphide concentrates by hydrometallurgical route, leaching with oxygen under high pressure is used.
Reason: Presence of oxygen under high pressure causes roasting of sulphides, which helps in leaching of the values.
Assertion: For the extraction of metal values from their sulphide concentrates by hydrometallurgical route, leaching with oxygen under high pressure is used.
Reason: Presence of oxygen under high pressure causes roasting of sulphides, which helps in leaching of the values.
17. Phosphorous is added to copper melt to
18. The product(s) of roasting of a sulfide ore is (are)
19. Match. the entities in Column 1 with the corresponding processes in Column 2.
Column 1
Column 2
P. Xanthate salts
1. Extraction of AI
Q. Thiobacillus Ferrooxidans
2. Flotation
R. Hydrocyclone
3. Classification
S. Anode effect
4. Bacterial Leaching
| Column 1 | Column 2 |
| P. Xanthate salts | 1. Extraction of AI |
| Q. Thiobacillus Ferrooxidans | 2. Flotation |
| R. Hydrocyclone | 3. Classification |
| S. Anode effect | 4. Bacterial Leaching |