MCQOPTIONS
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MCQOPTIONS
This section includes 17 Mcqs, each offering curated multiple-choice questions to sharpen your Organic Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
UV-Vis spectroscopy of organic compounds is usually concerned with which electronic transition(s)? |
| A. | σ → σ* |
| B. | n → σ* |
| C. | n → π* and π → π* |
| D. | none of these |
| Answer» D. none of these | |
| 2. |
Beer's Law states that |
| A. | absorbance is proportional to both the path length and concentration of the absorbing species |
| B. | absorbance is proportional to the log of the concentration of the absorbing species |
| C. | absorbance is equal to P0 / P |
| D. | none of the above |
| Answer» B. absorbance is proportional to the log of the concentration of the absorbing species | |
| 3. |
In the equation, A = ε bc, what quantity is represented by "ε"? |
| A. | Absorbtivity |
| B. | Molar absorbtivity |
| C. | Path length |
| D. | None of these |
| Answer» C. Path length | |
| 4. |
Which of the following relationships between absorbance and %transmittance is incorrect? |
| A. | A = log10 100 / %T |
| B. | A = 2 - log10 %T |
| C. | A = log10 1 / T |
| D. | All are correct |
| Answer» D. All are correct | |
| 5. |
Vibrational spectroscopy is |
| A. | a large mass on a weak spring |
| B. | a flashlight through a prism and shake it |
| C. | a class of spectroscopic techniques which analyzes molecular motions |
| D. | an Infrared spectroscopy |
| Answer» D. an Infrared spectroscopy | |
| 6. |
Which type of ionic species are allowed to pass through the slit and reach the collecting plate? |
| A. | Negative ions of all masses |
| B. | positive ions of the specific mass |
| C. | Negative ions of the specific mass |
| D. | Positive ions of all masses |
| Answer» C. Negative ions of the specific mass | |
| 7. |
Separation of ions in mass spectrometer take place on the basis of which of the following? |
| A. | Mass |
| B. | Charge |
| C. | Molecular weight |
| D. | Mass to charge ratio |
| Answer» E. | |
| 8. |
A PMR spectrometer operates at 300 MHz. Find the value of magnetic field.Given: gN = 5.585 and BN = 5.05 x 10-27 JT-I. |
| A. | 7.05 T |
| B. | 6.38 T |
| C. | 7.58 T |
| D. | 5.93 T |
| Answer» B. 6.38 T | |
| 9. |
Separation of ions in mass spectrometer take place on the basis of which of the following?$ |
| A. | Mass |
| B. | Charge |
| C. | Molecular weight |
| D. | Mass to charge ratio |
| Answer» E. | |
| 10. |
Which_type_of_ionic_species_are_allowed_to_pass_through_the_slit_and_reach_the_collecting_plate? |
| A. | Negative ions of all masses |
| B. | positive ions of the specific mass |
| C. | Negative ions of the specific mass |
| D. | Positive ions of all masses |
| Answer» C. Negative ions of the specific mass | |
| 11. |
Which species of the following is used to bombard with the sample for which mass spectroscopy has been performed? |
| A. | Alpha particles |
| B. | Neutrons |
| C. | Electrons |
| D. | Protons |
| Answer» D. Protons | |
| 12. |
What are the main criteria on which mass spectrometer used for? |
| A. | Composition in sample |
| B. | Relative mass of atoms |
| C. | Concentration of elements in the sample |
| D. | Properties of sample |
| Answer» C. Concentration of elements in the sample | |
| 13. |
A PMR spectrometer operates at 300 MHz. Find the value of magnetic field. |
| A. | |
| B. | 7.05 T |
| C. | 6.38 T |
| Answer» B. 7.05 T | |
| 14. |
In which state of matter mass spectroscopy is being performed? |
| A. | solid |
| B. | liquid |
| C. | gaseous |
| D. | plasma |
| Answer» D. plasma | |
| 15. |
Who discovered the mass spectrometer? |
| A. | Francis Aston |
| B. | J. J Thomson |
| C. | Ernest O. Lawrence |
| D. | Walter Kaufmann |
| Answer» C. Ernest O. Lawrence | |
| 16. |
Which of the following main component of mass spectroscopy deal with resolving the ions into their characteristics mass components according to their mass-to-charge ratio? |
| A. | Ion Source |
| B. | Analyzer |
| C. | Detector System |
| D. | Analyzer tube |
| Answer» C. Detector System | |
| 17. |
Which of the following statement is false for mass spectroscopy? |
| A. | Mass spectroscopy is used to identify unknown compounds within a sample, and to elucidate the structure and chemical properties of different molecules |
| B. | Particle are characterized by their mass to charge ratios (m/z) and relative abundances |
| C. | This technique basically studies the effect of ionizing energy on molecules |
| D. | This technique can be used on all state of matter |
| Answer» E. | |