- 1(current)
Q. No.| Assertion (A): | Hydrometallurgy involves dissolving the ore in a suitable reagent followed by precipitation by a more electropositive metal. |
| Reason (R): | Copper is extracted by hydrometallurgy. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | (A) is false but (R) is true. |
Given below are two statements:
| Assertion (A): | Sulphide ores are concentrated by the froth flotation method. |
| Reason (R): | Cresols stabilise the froth in the froth flotation method. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | (A) is false but (R) is true. |
Which of the following statements are correct?
a. A depressant prevents certain types of particles to come to the froth.
b. Copper matte contains and .
c. The solidified copper obtained from the reverberatory furnace has a blistered appearance due to the evolution of during the extraction.
d. Zinc can be extracted by self-reduction.
Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, c)
Match the items of Column I with items of Column II and assign the correct code.
| Column I | Column II | ||
| A | Blistered Cu | 1. | Aluminium |
| B | Blast furnace | 2. | 2Cu2O + Cu2S → 6Cu + SO2 |
| C | Reverberatory furnace | 3. | Iron |
| D | Hall-Heroult process | 4. | FeO + SiO2 → FeSiO3 |
| 5. | 2 Cu2S + 3O2 → 2Cu2O + 2SO2 | ||
Codes:
| Options: | A | B | C | D |
| 1. | 2 | 3 | 4 | 1 |
| 2. | 1 | 2 | 3 | 5 |
| 3. | 5 | 4 | 3 | 2 |
| 4. | 4 | 5 | 3 | 2 |
Match the items of Column I with items of Column II and assign the correct code.
|
Column I |
Column II |
|
A. Sapphire |
1. Al2O3 |
|
B. Sphalerite |
2. NaCN |
|
C. Depressant |
3. Co |
|
D. Corundum |
4. ZnS |
|
5. Fe2O3 |
Codes
A B C D
1. 3 4 2 1
2. 5 4 3 2
3. 2 3 4 5
4. 1 2 3 4
Match the items in Column I with the items in Column II, and assign the correct code.
| Column I | Column II |
| A. Cyanide process | 1. Ultrapure Ge |
| B. Froth flotation process | 2. Dressing of ZnS |
| C. Electrolytic reduction | 3. Extraction of Al |
| D. Zone refining | 4. Extraction of Au |
| 5. Purification of Ni |
Codes
| A | B | C | D | |
| 1. | 4 | 2 | 3 | 1 |
| 2. | 2 | 3 | 1 | 5 |
| 3. | 1 | 2 | 3 | 4 |
| 4. | 3 | 4 | 5 | 1 |
Match the items in Column I with the items in Column II and assign the correct code.
| Column I | Column II |
| A. Pendulum | 1. Chrome steel |
| B. Malachite | 2. Nickel Steel |
| C. Calamine | 3. Na3AlF6 |
| D. Cryolite | 4. CuCO3. Cu (OH)2 |
| 5. ZnCO3 |
Codes
| A | B | C | D | |
| 1. | 1 | 2 | 3 | 4 |
| 2. | 2 | 4 | 5 | 3 |
| 3. | 2 | 3 | 4 | 5 |
| 4. | 4 | 5 | 3 | 2 |
- 1(current)
Q. No.
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