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Q. No.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
Codes
Subtopic: Intro - Flux, Leaching, Roasting & Calcination |
89%
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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 |
Subtopic: Refining Process |
92%
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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 |
Subtopic: Intro - Flux, Leaching, Roasting & Calcination | Refining Process |
84%
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Select the correct option based on statements below:
| 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. |
Subtopic: Refining Process |
80%
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Select the correct option based on the statements below:
| 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. |
Subtopic: Refining Process |
81%
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Select the correct option based on statements below:
| Assertion (A): | The zone refining method is very useful for producing semiconductors. |
| Reason (R): | Semiconductors are of high purity. |
| 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. |
Subtopic: Refining Process |
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Select the correct option based on statements below:
| 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. |
Subtopic: Intro - Flux, Leaching, Roasting & Calcination |
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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
Subtopic: Metallurgy of individual elements |
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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
Subtopic: Intro - Flux, Leaching, Roasting & Calcination |
54%
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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
Subtopic: Intro - Flux, Leaching, Roasting & Calcination |
78%
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