MCQOPTIONS
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MCQOPTIONS
This section includes 11 Mcqs, each offering curated multiple-choice questions to sharpen your Phase Transformation knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
When does the strain energy change can make a difference in the enthalpy of mixing in real solutions? |
| A. | When the temperature is high |
| B. | When the size difference between atoms is very large |
| C. | When the temperature is low |
| D. | When the size difference between atoms is very small |
| Answer» C. When the temperature is low | |
| 2. |
The variation of activity with composition is given below, out of this which one obeys Raoults law__________ |
| A. | 1 |
| B. | 2 |
| C. | 4 |
| D. | 3 |
| Answer» B. 2 | |
| 3. |
Assuming that A and B mix to form a substitutional solid solution and that all configurations of A and B atoms are equally probable, the number of distinguishable ways of arranging the atoms on the atom sites, if N1=8 and N2=4 is_____ (N1, N2 are the number of atoms in A and B respectively). |
| A. | 467 |
| B. | 499 |
| C. | 495 |
| D. | 500 |
| Answer» D. 500 | |
| 4. |
Partial molar free energy of a pure substance A or alternatively the chemical potential of A in the phase depends on_____ |
| A. | Composition |
| B. | Volume |
| C. | Enthalpy |
| D. | Configuration |
| Answer» B. Volume | |
| 5. |
The configurational entropy depends on _____ |
| A. | Thermodynamic probability |
| B. | Volume |
| C. | Composition |
| D. | Frequency of mixing |
| Answer» B. Volume | |
| 6. |
In case of an ideal system ΔH of mixing is _________ |
| A. | Negative |
| B. | Positive |
| C. | Zero |
| D. | Cannot be determined |
| Answer» D. Cannot be determined | |
| 7. |
If we allow inter diffusion to taken place between the elements A and B, there will be change in the free energy because of mixing, if the total molar free energy g of a purely mechanical mixture is 8 Jmol-1and the ΔG of mix is 5Jmol-1, then the total free energy of the system is ____________ |
| A. | 3 Jmol-1 |
| B. | 13 Jmol-1 |
| C. | 40 Jmol-1 |
| D. | 15 Jmol-1 |
| Answer» C. 40 Jmol-1 | |
| 8. |
In endothermic transformation the enthalpy of mixing is __________ |
| A. | Less than zero |
| B. | Zero |
| C. | Greater than zero |
| D. | One |
| Answer» D. One | |
| 9. |
In an exothermic transformation, the total free energy of the system will change far more drastically with composition at higher temperature compared to a lower temperature. |
| A. | False |
| B. | True |
| Answer» C. | |
| 10. |
If we consider that there are no volume and enthalpy changes caused by mixing, then the only contribution to the entropy will be__________ |
| A. | Thermal |
| B. | Configurational |
| C. | Hydrostatic |
| D. | Rotational |
| Answer» C. Hydrostatic | |
| 11. |
When X1 mole of A and X2 mole of B are brought together, the corresponding free energy of system is given by___________ (where G1 and G2 are Gibbs energy of pure X1, X2 respectively) |
| A. | X1*G1+X2*G2 |
| B. | X1*G2+X2*G1 |
| C. | X1*(G1+G2) |
| D. | X2*(G1+G2) |
| Answer» B. X1*G2+X2*G1 | |