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Q. No.The method of zone refining of metals is based on the principle of:
1.
Greater mobility of the pure metal than that of the impurity
2.
Higher melting point of the impurity than that of the pure metal
3.
Greater noble character of the solid metal than that of the impurity
4.
Greater solubility of the impurity in the molten state than in the solid
Subtopic: Refining Process |
69%
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AIPMT - 2003
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Which one of the following methods can be used to obtain highly pure metal which is liquid at room temperature?
1. Distillation
2. Zone refining
3. Electrolysis
4. Chromatography
Subtopic: Refining Process |
52%
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NEET - 2021
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The maximum temperature that can be achieved in blast furnace is :
1. Upto 1900 K
2. Upto 5000 K
3. Upto 1200 K
4. Upto 2200 K
Subtopic: Metallurgy of individual elements |
70%
From NCERT
NEET - 2021
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Subtopic: Metallurgy of individual elements |
70%
From NCERT
AIPMT - 1998
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The following reactions take place in the blast furnace in the preparation of impure iron.
Identify the reaction pertaining to the formation of the slag.
1. 2C(s) + O2(g) → 2CO (g)
2. Fe2O3(s) + 3CO (g) → 2Fe(l) + 3CO2(g)
3. CaCO3(s) → CaO(s) + CO2(g)
4. CaO(s) + SiO2(s) → CaSiO3(s)
Subtopic: Intro - Flux, Leaching, Roasting & Calcination |
77%
From NCERT
AIPMT - 2011
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Match List-I with List-II
Choose the correct answer from the options given below:
| List- I (ores) | List- II (Composition) |
| (a) Haematite | (i) \(Fe_3O_4\) |
| (b) Magnetite | (ii) \(ZnCO_3\) |
| (c) Calamine | (iii) \(Fe_2O_3\) |
| (d) Kaolinite | (iv) \([Al_2(OH)_4Si_2O_5]\) |
| (a) | (b) | (c) | (d) | |
| 1. | (i) | (iii) | (ii) | (iv) |
| 2. | (i) | (ii) | (iii) | (iv) |
| 3. | (iii) | (i) | (ii) | (iv) |
| 4. | (iii) | (i) | (iv) | (ii) |
Subtopic: Intro - Flux, Leaching, Roasting & Calcination |
75%
From NCERT
NEET - 2022
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Given below are two statements:
| I: | The Ellingham diagram provides an idea about the feasibility of a reaction. |
| II: | The Ellingham diagram explains the rate of the reduction reactions. |
In light of the above statements, choose the most appropriate answer from the options given below:
| 1. | I is correct and II is incorrect. |
| 2. | I is incorrect and II is correct. |
| 3. | Both I and II are correct. |
| 4. | Both I and II are incorrect. |
Subtopic: Ellingham Diagram |
57%
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NEET - 2022
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Which one of the following is not a calcination reaction?
1. \(\mathrm{ZnCO}_3 \xrightarrow[]{\Delta} \mathrm{ZnO}+\mathrm{CO}_2\)
2. \(\mathrm{Fe}_2 \mathrm{O}_3 \cdot \mathrm{xH}_2 \mathrm{O} \stackrel{\Delta}{\longrightarrow} \mathrm{Fe}_2 \mathrm{O}_3+\mathrm{xH}_2 \mathrm{O}\)
3. \(\mathrm{CaCO}_3 \cdot \mathrm{MgCO}_3 \stackrel{\Delta}{\longrightarrow} \mathrm{CaO}+\mathrm{MgO}+2 \mathrm{CO}_2\)
4. \(\mathrm{CaCO}_3+2 \mathrm{HCl} \stackrel{\Delta}{\longrightarrow} \mathrm{CaCl}_2+\mathrm{H}_2 \mathrm{O}+\mathrm{CO}_2\)
1. \(\mathrm{ZnCO}_3 \xrightarrow[]{\Delta} \mathrm{ZnO}+\mathrm{CO}_2\)
2. \(\mathrm{Fe}_2 \mathrm{O}_3 \cdot \mathrm{xH}_2 \mathrm{O} \stackrel{\Delta}{\longrightarrow} \mathrm{Fe}_2 \mathrm{O}_3+\mathrm{xH}_2 \mathrm{O}\)
3. \(\mathrm{CaCO}_3 \cdot \mathrm{MgCO}_3 \stackrel{\Delta}{\longrightarrow} \mathrm{CaO}+\mathrm{MgO}+2 \mathrm{CO}_2\)
4. \(\mathrm{CaCO}_3+2 \mathrm{HCl} \stackrel{\Delta}{\longrightarrow} \mathrm{CaCl}_2+\mathrm{H}_2 \mathrm{O}+\mathrm{CO}_2\)
Subtopic: Intro - Flux, Leaching, Roasting & Calcination |
55%
From NCERT
NEET - 2022
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The correct statement among the following is:
| 1. | Blister copper has a blistered appearance due to the evolution of CO2. |
| 2. | Vapour phase refining is carried out for nickel by the Van Arkel method. |
| 3. | Pig iron can be moulded into a variety of shapes. |
| 4. | Wrought iron is impure iron with 4 % carbon. |
Subtopic: Refining Process |
60%
From NCERT
NEET - 2020
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The reaction that does not take place in a blast furnace between 900 K to 1500 K temperature range during the extraction of iron is:
1. CaO + SiO2 → CaSiO3
2. Fe2O3 + CO → 2FeO + CO2
3. FeO + CO → Fe +CO2
4. C + CO2 → 2CO
1. CaO + SiO2 → CaSiO3
2. Fe2O3 + CO → 2FeO + CO2
3. FeO + CO → Fe +CO2
4. C + CO2 → 2CO
Subtopic: Metallurgy of individual elements |
From NCERT
NEET - 2023
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