MCQOPTIONS
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MCQOPTIONS
This section includes 39 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry Mcqs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The rate of reaction |
| A. | Increases as the reaction proceeds |
| B. | Decreases as the reaction proceeds |
| C. | Remains the same as the reaction proceeds |
| D. | May decrease or increase as the reaction proceeds |
| Answer» C. Remains the same as the reaction proceeds | |
| 2. |
The addition of a catalyst to the reaction system |
| A. | Increases the rate of forward reaction only |
| B. | Increases the rate of reverse reaction |
| C. | Increases the rate of forward but decreases the rate of backward reaction |
| D. | Increases the rate of forward as well as backward reaction equally |
| Answer» E. | |
| 3. |
The specific rate constant of a first order reaction depends on the |
| A. | Time |
| B. | Concentration of the reactant |
| C. | Temperature |
| D. | Concentration of the product |
| Answer» D. Concentration of the product | |
| 4. |
On increasing the temperature the rate of reaction increases mainly because |
| A. | The activation energy of the reaction increases |
| B. | Concentration of the reacting molecules increases |
| C. | Collision frequency increases |
| D. | None of these |
| Answer» D. None of these | |
| 5. |
?d[N2O5]/dt represents |
| A. | Rate of formation of N2O5 |
| B. | Rate of decomposition of N2O5 |
| C. | Order of the reaction |
| D. | None |
| Answer» C. Order of the reaction | |
| 6. |
The value of activation energy is primarily determined by |
| A. | Temperature |
| B. | Effective collision |
| C. | Concentration of reactants |
| D. | Chemical nature of reactants and products |
| Answer» C. Concentration of reactants | |
| 7. |
Sum of exponents of molar concentration is called |
| A. | Order of reaction |
| B. | Molecularity |
| C. | Rate of reaction |
| D. | Average of reaction |
| Answer» B. Molecularity | |
| 8. |
Spontaneous reactions are |
| A. | Moderate |
| B. | Slow |
| C. | Fast |
| D. | Not natural |
| Answer» D. Not natural | |
| 9. |
In rate expression the concentration of reactants is negative. It shows |
| A. | Concentration of reactant does not change |
| B. | Concentration of product increases |
| C. | Concentration of reactant decreases |
| D. | Concentration of reactant increases |
| Answer» D. Concentration of reactant increases | |
| 10. |
Unit of rate of reaction is |
| A. | Moles dm-3 sec-1 |
| B. | Moles dm-3 |
| C. | Moles sec-1 |
| D. | Mol-1 dm3 sec-1 |
| Answer» B. Moles dm-3 | |
| 11. |
Rate of disappearance of reactant is equal to |
| A. | Rate of reaction |
| B. | Rate of formation of product |
| C. | Energy released during reaction |
| D. | A and b |
| Answer» B. Rate of formation of product | |
| 12. |
When a graph is plotted between 1/T on X-axis and log k on y-axis a straight line is obtained with a negative slope which has two end in |
| A. | I and II quadrant |
| B. | II and III quadrant |
| C. | III and IV quadrant |
| D. | II and IV quadrant |
| Answer» E. | |
| 13. |
Rate of reaction when concentration of reactants are taken as unity is called |
| A. | Arrhenius constant |
| B. | Molecularity |
| C. | Specific rate constant |
| D. | Ideal rate constant |
| Answer» D. Ideal rate constant | |
| 14. |
Order of reaction of 2N2O5 ? 2N2O4+O2 is |
| A. | First order |
| B. | Second order |
| C. | Third order |
| D. | Zero order |
| Answer» B. Second order | |
| 15. |
For 3rd order reaction the hhalf life is inversely proportional to initial concentration of reactants |
| A. | Single |
| B. | Square |
| C. | Cube |
| D. | Raise to power four |
| Answer» C. Cube | |
| 16. |
A substance which increases the reactivity of enzyme is called |
| A. | Promoters |
| B. | Inhibitors |
| C. | Stimulators |
| D. | Non-activators |
| Answer» B. Inhibitors | |
| 17. |
Addition of tetraethyl lead in petrol is example of |
| A. | Ve catalysis |
| B. | ?ve catalysis |
| C. | Auto catalysis |
| D. | Anti catalysis |
| Answer» C. Auto catalysis | |
| 18. |
When a product acts as catalyst then it is called |
| A. | Autocatalsis |
| B. | ?ve catalysis |
| C. | Ve catalysis |
| D. | Self catalysis |
| Answer» B. ?ve catalysis | |
| 19. |
Radiations are absorbed in |
| A. | Spectrophotometer method |
| B. | Dilatometric method |
| C. | Optical relation method |
| D. | Refractometric method |
| Answer» B. Dilatometric method | |
| 20. |
End name of enzyme is |
| A. | Yl |
| B. | Ase |
| C. | One |
| D. | Al |
| Answer» C. One | |
| 21. |
When the reaction completes in more than one steps rate of reaction will be determined by |
| A. | Fast step |
| B. | Slowest step |
| C. | All steps |
| D. | Molecularity of the reaction |
| Answer» C. All steps | |
| 22. |
For determining the order of reaction we use |
| A. | Refractometric method |
| B. | Dilatometric method |
| C. | Optical activity method |
| D. | Half life method |
| Answer» E. | |
| 23. |
Energy of activation for backward reaction is less than forward reaction for ________ reaction |
| A. | Endothermic |
| B. | Exothermic |
| C. | Moderate |
| D. | Fast |
| Answer» B. Exothermic | |
| 24. |
The unit of slope in Arrhenius plot to calculate the energy of activation is |
| A. | K-1 |
| B. | ?F |
| C. | K |
| D. | ?C |
| Answer» D. ?C | |
| 25. |
Which order of reaction obeys the relation t1/2 = 1/Ka |
| A. | First order |
| B. | Second order |
| C. | Third order |
| D. | Zero order |
| Answer» C. Third order | |
| 26. |
Activated complex is formed due to |
| A. | Pressure |
| B. | Effective collision |
| C. | Ineffective collisions |
| D. | Temperature |
| Answer» C. Ineffective collisions | |
| 27. |
Energy of reactant higher than energy of product favours |
| A. | Endothermic |
| B. | Exothermic |
| C. | Moderate reaction |
| D. | No reaction |
| Answer» C. Moderate reaction | |
| 28. |
Energy required to form transition state is called |
| A. | Ea |
| B. | P.E |
| C. | V |
| D. | K.E |
| Answer» B. P.E | |
| 29. |
Which of the following will have very high rate of reaction? |
| A. | Double decomposition reaction |
| B. | Neutralization reaction |
| C. | Ionic reactions |
| D. | All of above |
| Answer» E. | |
| 30. |
Greater the conc. Of reactant |
| A. | Greater will be dx/dt |
| B. | Lesser will be dx/dt |
| C. | Dx/dt will be moderate |
| D. | Any of above |
| Answer» B. Lesser will be dx/dt | |
| 31. |
Anything which increases rate of reaction without being involved in the reaction |
| A. | Promoter |
| B. | Catalyst |
| C. | Inhibitor |
| D. | All of the above |
| Answer» C. Inhibitor | |
| 32. |
The substances that reduces the effectiveness of a catalyst are called |
| A. | Promoters |
| B. | Poisoning catalysts |
| C. | Inhibitors |
| D. | Pro-catalysts |
| Answer» C. Inhibitors | |
| 33. |
When catalysts and reactants are in more than one phase it is |
| A. | Homogeneous catalysis |
| B. | Heterogeneous catalysis |
| C. | Catalysis |
| D. | Ea |
| Answer» C. Catalysis | |
| 34. |
Each catalyst has |
| A. | Specificity |
| B. | Special structure |
| C. | Its own Ea |
| D. | All of above |
| Answer» E. | |
| 35. |
An enzyme has its specificity due to |
| A. | Substrate |
| B. | Structure |
| C. | Temperature |
| D. | Pressure |
| Answer» C. Temperature | |
| 36. |
Biocatalytical proteins are |
| A. | Enzymes |
| B. | Substrate |
| C. | Lipids |
| D. | Any of above |
| Answer» B. Substrate | |
| 37. |
Co-enzymes are |
| A. | Non proteineous |
| B. | Proteineous |
| C. | Sugars |
| D. | Lipids |
| Answer» B. Proteineous | |
| 38. |
Which statement is incorrect about catalyst |
| A. | It is used in smaller amount |
| B. | Decrease activation energy |
| C. | Specific in action |
| D. | It affects specific rate constant |
| Answer» E. | |
| 39. |
Which of the following type of reaction is 3rd order reaction |
| A. | 2N2O5 = 2N2O4 + O3 |
| B. | NO + O3 ? NO2 + O2 |
| C. | 2FeCl3 + 6KI ? 2FeI2 + 6KCl + I2 |
| D. | None of these |
| Answer» D. None of these | |