MCQOPTIONS
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MCQOPTIONS
This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
How are the oxides of less reactive metals like silver and mercury reduced? |
| A. | By thermal decomposition |
| B. | By electrolysis |
| C. | By using reducing agents |
| D. | Cannot be reduced |
| Answer» B. By electrolysis | |
| 2. |
Any metal will reduce the oxide of other metals which lie below it in the Ellingham diagram. |
| A. | True |
| B. | False |
| Answer» C. | |
| 3. |
Which of the following is false regarding the Ellingham diagram? |
| A. | It consists of plots of ΔfG° vs T |
| B. | Ellingham diagrams are based on thermodynamic concepts |
| C. | They do not tell us anything about the kinetics of the reduction process |
| D. | They do not assume reactant-product equilibrium |
| Answer» E. | |
| 4. |
Under what condition can Al reduce MgO? |
| A. | Above 1000°C |
| B. | Below 1000°C |
| C. | Above 1350°C |
| D. | Below 1350°C |
| Answer» D. Below 1350°C | |
| 5. |
What does the Ellingham diagram consist of? |
| A. | Plots of ΔfG° vs T |
| B. | Plots of T vs ΔfG° |
| C. | Plots of ΔfG° vs ΔS |
| D. | Plots of ΔS vs ΔfG° |
| Answer» B. Plots of T vs ΔfG° | |
| 6. |
How can a reaction with positive ΔG be made to occur? |
| A. | By increasing the temperature |
| B. | By decreasing the temperature |
| C. | By coupling it with another reaction |
| D. | It is not possible for the reaction to occur |
| Answer» D. It is not possible for the reaction to occur | |
| 7. |
What is the criterion of the feasibility of a reaction at any temperature? |
| A. | ΔG of the reaction must be positive |
| B. | ΔG of the reaction must be negative |
| C. | ΔG of the reaction must be equal to zero |
| D. | Does not depend on ΔG of the reaction |
| Answer» C. ΔG of the reaction must be equal to zero | |
| 8. |
Which of the following is the correct Gibbs equation? |
| A. | ΔG = ΔH + TΔS |
| B. | ΔG = ΔH – TΔS |
| C. | ΔG = ΔH – 2TΔS |
| D. | ΔG = ΔH – 3TΔS |
| Answer» C. ΔG = ΔH – 2TΔS | |
| 9. |
Ellingham Diagram does not give any information regarding the kinetics of the reduction process. |
| A. | True |
| B. | False |
| Answer» B. False | |