Q. No.From the following, the correct statements about the role of substances added in the froth flotation process are:
a.
Collectors enhance the non-wettability of the mineral particles.
b.
Collectors enhance the wettability of gangue particles.
c.
By using depressants in the process, two sulphide ores can be separated.
d.
Froth stabilisers decrease the wettability of gangue.
1. a and b
2. b and c
3. c and d
4. a and c
1. a and b
2. b and c
3. c and d
4. a and c
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 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 |
Match the items in Column I with the items in Column II and assign the correct code.
| Column I | Column II |
| A. Coloured Bands | 1. Zone refining |
| B. Impure metal to volatile complex | 2. Fractional distillation |
| C. Purification of Ge and Si | 3. Mond’s process |
| D. Purification of mercury | 4. Chromatography |
| 5. Liquation |
Codes
| A | B | C | D | |
| 1. | 1 | 2 | 3 | 4 |
| 2. | 4 | 3 | 1 | 2 |
| 3. | 3 | 4 | 2 | 1 |
| 4. | 5 | 4 | 3 | 2 |
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 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 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 |
| Assertion (A): | Nickel can be purified by Mond’s process. |
| Reason (R): | It is a volatile compound that decomposes at 460 K to give pure Ni. |
| 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. |
| Assertion (A): | Zirconium can be purified by the van Arkel method. |
| Reason (R): | ZrI4 is volatile and decomposes at 1800 K. |
| 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. |
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