Reactions among the following that occur during calcination are:
a. | CaCO3 → CaO + CO2 |
b. | \(\frac{11}{2}\)O2 → Fe2O3 + SO2 | 2FeS2 +
c. | Al2O3.xH2O → Al2O3 + xH2O |
d. | \(\frac{3}{2}\)O2 → ZnO + SO2 | ZnS +
Choose the correct option:
1. a and b
2. b and c
3. c and d
4. a and c
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
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 |
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
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 |
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
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 |
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
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. |
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
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. |
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
From the following, the ores that are concentrated by froth flotation are:
a. | Haematite | b. | Galena |
c. | Copper pyrites | d. | Magnetite |
Choose the correct option:
1. a and b
2. b and c
3. c and d
4. a and d
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
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
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
In the extraction of aluminium by the Hall-Heroult process, purified is mixed with to:
a. | Lower the melting point of |
b. | Increase the conductivity of the molten mixture. |
c. | Reduce into |
d. | Act as a catalyst |
Choose the correct option:
1. a and b
2. b and c
3. c and d
4. a and d
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
Which of the following metals can be purified by electrolytic refining?
1. Cu, and Zn
2. Ge, and Si
3. Zr, and Ti
4. Zn, and Hg
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.