Q. No.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. \(\mathrm{CaCO}_3+2 \mathrm{HCl} \stackrel{\Delta}{\longrightarrow} \mathrm{CaCl}_2+\mathrm{H}_2 \mathrm{O}+\mathrm{CO}_2\)
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. |
| 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) |
1. CaO + SiO2 → CaSiO3
2. Fe2O3 + CO → 2FeO + CO2
3. FeO + CO → Fe +CO2
4. C + CO2 → 2CO
| A. | Chrome steel is used for cutting tools and crushing machines. |
| B. | The fine dust of aluminium is used in paints and lacquers. |
| C. | Copper is used for the reduction of alcohol. |
| D. | Zinc dust is used as a reducing agent in the manufacturing of paints. |
| E. | Iron is used for galvanising zinc. |
1. (D) and (E) only
2. (A) and (D) only
3. (A), (B) and (D) only
4. (B), (C) and (D) only
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
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
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 |
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)
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