McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Bachelor of Pharmacy (B. Pharma) , Pharmacy .
Chapters
| 1. |
In the photochemical degradation of multisulpha preparation, the order that the reaction follows is: |
| A. | first |
| B. | pseudo first |
| C. | second |
| D. | zero |
| Answer» D. zero | |
| 2. |
The integral rate equation for a reaction (in common notation) is written as log C = log Co - (kt/2.303). When a graph is drawn log c vs. t, the slope will be: |
| A. | negative |
| B. | one |
| C. | Positive |
| D. | Zero |
| Answer» A. negative | |
| 3. |
The integral equation (in common notation) k = x/at (a - x) is concerned with the order: |
| A. | first |
| B. | pseudo first |
| C. | second |
| D. | zero |
| Answer» C. second | |
| 4. |
When a series of steps are involved in a reaction, the ‘overall rate’ of a reaction depends upon the rate(s) of: |
| A. | all steps |
| B. | all steps which follow the slowest step |
| C. | all steps which precede the slowest step |
| D. | the slowest step |
| Answer» C. all steps which precede the slowest step | |
| 5. |
The solid state decomposition of aspirin in presence of moisture follows the order: |
| A. | first |
| B. | pseudofirst |
| C. | second |
| D. | zero |
| Answer» D. zero | |
| 6. |
The reaction rate constant (k) is 2.0 x 10-3 min.-1 for aspirin hydrolysis in 0.1 N hydrochloric acid at 1mg/ml concentration. Under same conditions, if the product contains aspirin 4 mg/ml of the initial concentration, the k value in minutes-1 will be: |
| A. | 0.5 x l0-3 |
| B. | 2.0 x 10-3 |
| C. | 4.0 x 10-3 |
| D. | 8.0 x 10-3 |
| Answer» B. 2.0 x 10-3 | |
| 7. |
A second order reaction follows pseudo-first order reaction, when the concentrations of: |
| A. | two reactants are high |
| B. | two reactants are low |
| C. | one reactant is far higher than the other reactant. |
| D. | two reactants are equal |
| Answer» C. one reactant is far higher than the other reactant. | |
| 8. |
In the study of the rate of a reaction, 100 ml of 0.1 N hydrochloric acid is added to 10 ml methyl acetate for the reaction to occur. The reason for making such a proportion is to make: |
| A. | analysis of degradation is easy |
| B. | reaction to follow first order |
| C. | reaction to proceed slowly |
| D. | reaction to undergo a pseudo first order |
| Answer» D. reaction to undergo a pseudo first order | |
| 9. |
The conversion of trans-stilbene to cis-stilbene follows the molecularity: |
| A. | bimolecular |
| B. | termolecular |
| C. | unimolecular |
| D. | zeromolccular |
| Answer» C. unimolecular | |
| 10. |
In the hydrolysis of sucrose in hydrochloric acid solution, the change in the optical rotation follows the order: |
| A. | pseudofirst |
| B. | pseudo zero |
| C. | second |
| D. | zero |
| Answer» A. pseudofirst | |
| 11. |
In the degradation studies of aspirin suspension, the orders observed initially and at the end, respectively, are: - |
| A. | first, second |
| B. | first, zero |
| C. | second, first |
| D. | zero, first |
| Answer» D. zero, first | |
| 12. |
A prescription of liquid aspirin preparation contained 6.5 g/100 ml. The solubility of aspirin at 25°C is 0.33 g/100 ml. The order of reaction in the kinetic study is: |
| A. | apparent first |
| B. | apparent zero |
| C. | first |
| D. | second |
| Answer» B. apparent zero | |
| 13. |
The time required for the complete degradation of a drug in solution is a finite value. The order of that reaction is: |
| A. | first |
| B. | pseudo first |
| C. | second |
| D. | zero |
| Answer» D. zero | |
| 14. |
Normally, ethyl acetate undergoes hydrolysis in presence of H+ and (OH)-ions. The order of the reaction observed in the acidic and alkaline solutions, respectively, are: |
| A. | first and second |
| B. | pseudo first and second |
| C. | second and first |
| D. | second and pseudo first |
| Answer» B. pseudo first and second | |
| 15. |
In reactions that follow first order kinetics, half life is expressed by equation: |
| A. | 0.693/k1 |
| B. | 0.301/k1 |
| C. | 0.105/k1 |
| D. | k1/0.693 |
| Answer» A. 0.693/k1 | |
| 16. |
The units for the specific rate constant for a second order reaction are: |
| A. | liter/moles.sec |
| B. | liter.sec/moles |
| C. | moles/liter.sec |
| D. | moles.sec/liter |
| Answer» A. liter/moles.sec | |
| 17. |
The half life of a first order reaction is 4 years. What is its shelf life (in years)? |
| A. | 0.02 |
| B. | 0.03 |
| C. | 0.17 |
| D. | 0.61 |
| Answer» D. 0.61 | |
| 18. |
Which one of the following dosage forms exhibit faster rate of reaction under normal conditions? |
| A. | emulsions |
| B. | ointments |
| C. | solutions |
| D. | suspensions |
| Answer» C. solutions | |
| 19. |
In chemical kinetics, the rate of a reaction is expressed as (-dc/dt), where dc refers to the concentration. Whose concentration does it refer to? |
| A. | catalyst |
| B. | product |
| C. | reactant |
| D. | solvent medium |
| Answer» C. reactant | |
| 20. |
Which one of the following can be designated as the molecularity of a reaction? |
| A. | half |
| B. | one |
| C. | one and half |
| D. | zero |
| Answer» B. one | |
| 21. |
Which one of them is refered as a general rate equation (-dc/dt) for a second order? |
| A. | A°B° |
| B. | A1B1 |
| C. | A1B2 |
| D. | A2B2 |
| Answer» B. A1B1 | |
| 22. |
Which-one of the following orders have abundant applications in biological processes? |
| A. | first |
| B. | second |
| C. | third |
| D. | zero |
| Answer» A. first | |
| 23. |
In a chemical reaction, the rate constant is independent of the initial concentration. Which one of them is the order? |
| A. | first |
| B. | second |
| C. | third |
| D. | zero |
| Answer» D. zero | |
| 24. |
Chemical kinetics is the study of the |
| A. | rate of chemical reactions |
| B. | particle size |
| C. | rheological property |
| D. | interfacial tension |
| Answer» A. rate of chemical reactions | |
| 25. |
Rate of reaction is the |
| A. | number of reactant molecules or atoms that take part in chemical reactions to give the products. |
| B. | sum of exponents or powers of concentration terms in the rate equation |
| C. | time required for reactant concentration to decrease to 90% of the initial concentration. |
| D. | speed at which chemical reaction takes place |
| Answer» D. speed at which chemical reaction takes place | |
| 26. |
When rate is independent of the reactant concentration, then it is called |
| A. | zero order reaction. |
| B. | Pseudo zero order reaction |
| C. | First order reaction |
| D. | Second order reaction |
| Answer» A. zero order reaction. | |
| 27. |
In the equation, Rate = k[C]c[D]d, the order of the above reaction is |
| A. | k |
| B. | C + D |
| C. | [C] *[D] |
| D. | c + d |
| Answer» D. c + d | |
| 28. |
Which of the following is the half life of zero order reaction |
| A. | t1/2 = Ao/2k |
| B. | t1/2 = 0.693/2k |
| C. | t1/2 = Ao/2 |
| D. | t1/2 = 2k/ Ao |
| Answer» A. t1/2 = Ao/2k | |
| 29. |
The unit of k for zero order reaction is |
| A. | moles/litre/second |
| B. | moles |
| C. | moles/second |
| D. | moles/litre |
| Answer» A. moles/litre/second | |
| 30. |
Which of the following is the half life of first order reaction |
| A. | t1/2 = A0/2k |
| B. | t1/2 = 0.693/2k |
| C. | t1/2 = 2k |
| D. | t1/2 = 0.693/k |
| Answer» D. t1/2 = 0.693/k | |
| 31. |
The unit of rate constant for second order reaction is |
| A. | litre.mole-2 sec-2 |
| B. | litre.mole-2 sec-1 |
| C. | litre |
| D. | litre.mole-1 sec-1 |
| Answer» D. litre.mole-1 sec-1 | |
| 32. |
Which of the following method/s used for determination of order of reaction? |
| A. | Graphic method |
| B. | Substitution method |
| C. | Half life method |
| D. | All of the above - |
| Answer» D. All of the above - | |
| 33. |
The value of t1/2 for second order reaction is |
| A. | 1/ak |
| B. | 0.693/k |
| C. | Ao/2k |
| D. | Ao/2 |
| Answer» A. 1/ak | |
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