MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Is a relationship between reaction quotient and Gibbs free energy at a temperature T? |
| A. | G = G<sub>0</sub> + RT lnQ |
| B. | G = G<sub>0</sub> + RT lnk |
| C. | G = G<sub>0</sub> + R lnQ |
| D. | D = G<sub>0</sub> + RT lnQ |
| Answer» B. G = G<sub>0</sub> + RT lnk | |
| 2. |
What happens when reaction quotient is equal to the equilibrium constant? |
| A. | the reaction proceeds in the forward direction |
| B. | the reaction proceeds in the backward direction |
| C. | the reaction reaches equilibrium |
| D. | cannot predict |
| Answer» D. cannot predict | |
| 3. |
For a reaction, Kc = 3.81 10 3 and G0 = 13.8 kJ/mol. Then what is the value of R? |
| A. | -8.314J mol<sup> 1</sup>K<sup> 1</sup> |
| B. | 8.314J mol<sup> 1</sup>K<sup> 1</sup> |
| C. | cannot say as the temperature is not given |
| D. | -8.314J mol<sup> 1</sup> |
| Answer» C. cannot say as the temperature is not given | |
| 4. |
If the value of Gibbs free energy for a reaction is 20J/mol, the reaction is ___________ |
| A. | spontaneous |
| B. | nonspontaneous |
| C. | may be spontaneous |
| D. | may not be spontaneous |
| Answer» C. may be spontaneous | |
| 5. |
What did the Q depicted in the equation; G = G0 + RT lnQ? |
| A. | reaction coefficient |
| B. | reaction quotient |
| C. | equilibrium constant |
| D. | free energy |
| Answer» C. equilibrium constant | |
| 6. |
When is a reaction nonspontaneous? |
| A. | Gibbs free energy is positive |
| B. | Gibbs free energy is negative |
| C. | Gibbs free energy is zero |
| D. | Does not depend on Gibbs free energy |
| Answer» B. Gibbs free energy is negative | |
| 7. |
In a reaction, if the value of Gibbs free energy is greater than zero what does it infer? |
| A. | K is greater than 1 |
| B. | K is less than 1 |
| C. | K is equal to 1 |
| D. | Cannot deduce K from Gibbs free energy |
| Answer» C. K is equal to 1 | |
| 8. |
If the value of G0 is -2502 J/mol and K is 2, what is the temperature of the reaction that is occurring? |
| A. | 200 k |
| B. | 101 k |
| C. | 100 k |
| D. | 300 k |
| Answer» D. 300 k | |
| 9. |
For a chemical reaction, the value of G0 is -831.4 J/mol. Then what is the value of KC at 100 k? |
| A. | 1.0077 |
| B. | 1.077 |
| C. | 1.007 |
| D. | 2.7 |
| Answer» E. | |
| 10. |
In a reaction, at 300k, KC is given as 2 x 1013, then what is the value of G? |
| A. | 7.64 10<sup>4</sup> J |
| B. | 7.64 10<sup>4</sup> J mol<sup> 1</sup> |
| C. | 7.64 10 J mol<sup> 1</sup> |
| D. | 7.64 10<sup>4</sup> mol<sup> 1</sup> |
| Answer» C. 7.64 10 J mol<sup> 1</sup> | |