Q. No.
Reactions among the following that occur during calcination are:
a.
CaCO3 → CaO + CO2
b.
2FeS2 + \(\frac{11}{2}\)O2 → Fe2O3 + SO2
c.
Al2O3.xH2O → Al2O3 + xH2O
d.
ZnS + \(\frac{3}{2}\)O2 → ZnO + SO2
Choose the correct option:
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 ores can be reduced by carbon?
a. Haematite
b. Zincite
c. Iron pyrites
d. Sphalerite
Choose the correct option:
1. a and b
2. b and c
3. c and d
4. a and d
The main reactions that occur in the blast furnace during iron extraction from hematite are:
| a. | Fe2O3 + 3CO → 2Fe + 3CO2 |
| b. | FeO + SiO2 → FeSiO3 |
| c. | Fe2O3 + 3C \(\xrightarrow[]{}\) 2Fe + 3CO |
| d. | CaO + SiO2 \(\xrightarrow[]{}\) CaSiO3 |
Choose the correct option:
1. a and b
2. b and c
3. c and d
4. a and d
The following method of purification, where metal is converted to its volatile compound that gives pure metal is upon the decomposition :
a. Heating with a stream of carbon monoxide.
b. Heating with iodine.
c. Liquation
d. Distillation
Choose the correct option :
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)
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)
In the extraction of chlorine from brine ............
a. for the overall reaction is negative.
b. for the overall reaction is positive.
c. for the overall reaction has a negative value.
d. for the overall reaction has a positive value.
Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)
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
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