Q. No.The ore/s that can be concentrated by the magnetic separation method is/are :
1. Haematite
2. Siderite
3. Iron pyrite
4. All of the above
| 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) |
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. |
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. \(\mathrm{CaCO}_3+2 \mathrm{HCl} \stackrel{\Delta}{\longrightarrow} \mathrm{CaCl}_2+\mathrm{H}_2 \mathrm{O}+\mathrm{CO}_2\)
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
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
Consider the following graph.
At 1400 oC, the \(\Delta G_{r}^{o}\) the value for the reaction
2FeO + 2C → 2Fe + CO is
1. -116 kJ mol-1
2. -106 kJ mol-1
3. 100 kJ mol-1
4. -100 kJ mol-1
Consider the Ellingham diagram given below.
The Y-axis, and X-axis in the graph are respectively:
1. Gibbs energy(\(\Delta G_{r}^{o} \)), and Pressure
2. Gibbs energy (\(\Delta G_{r}^{o} \)), and temperature
3. Enthalpy(\(\Delta H_{r}^{o} \)), and temperature
4. Temperature, and Gibbs energy (\(\Delta H_{r}^{o} \))
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