List-I List-II Spectroscopy Property (A). Raman (I). Polarizability (B). FTIR (II). Dipole Moment (C). UV-Visible (III). Absorbance (D). NMR (IV). Spin
Choose the correct answer from the options given below:
Spectroscopy Properties Matching Explained
This section provides a detailed explanation for matching various spectroscopy techniques with their fundamental properties or the phenomena they measure. Understanding these core principles is crucial for analyzing chemical samples and interpreting spectral data.
Matching Spectroscopy Techniques with Properties
| List-I: Spectroscopy | List-II: Property |
|---|---|
| (A) Raman | (I) Polarizability |
| (B) FTIR | (II) Dipole Moment |
| (C) UV-Visible | (III) Absorbance |
| (D) NMR | (IV) Spin |
Detailed Explanation of Matches
Spectroscopy (A): Raman and Polarizability (I)
Raman spectroscopy works by observing the changes in the polarizability of molecules. When light interacts with a molecule, it can induce a temporary separation of charge, known as an induced dipole. The ease with which a molecule's electron cloud can be distorted by an electric field is called polarizability. Raman scattering occurs specifically due to the fluctuation of this polarizability during molecular vibrations or rotations. Thus, Raman spectroscopy is fundamentally linked to molecular polarizability.
Spectroscopy (B): FTIR and Dipole Moment (II)
Fourier Transform Infrared (FTIR) spectroscopy analyzes molecular vibrations by detecting the absorption or emission of infrared radiation. A key requirement for a molecular vibration to be detected by IR spectroscopy is that it must cause a change in the molecule's dipole moment. If a vibration leads to a change in the net molecular dipole moment, the molecule can interact with the infrared radiation. This makes the dipole moment change the critical property for IR activity.
Spectroscopy (C): UV-Visible and Absorbance (III)
UV-Visible spectroscopy measures how a substance absorbs light in the ultraviolet and visible regions of the electromagnetic spectrum. This absorption is typically associated with electronic transitions within the molecule, such as the excitation of electrons to higher energy levels. The technique quantifies the amount of light absorbed at specific wavelengths, which is known as absorbance. The intensity of this absorption is often related to the concentration of the absorbing species via the Beer-Lambert law.
Spectroscopy (D): NMR and Spin (IV)
Nuclear Magnetic Resonance (NMR) spectroscopy is a powerful technique that relies on the magnetic properties of atomic nuclei. Certain atomic nuclei possess an intrinsic quantum mechanical property called spin. These spinning nuclei behave like tiny magnets. NMR spectroscopy involves placing a sample in a strong magnetic field and applying radio frequency pulses to observe the resonance absorption of energy as nuclei transition between different spin states. Therefore, spin is the central property exploited in NMR.
Summary of Correct Matches
The correct pairing of spectroscopy techniques with their associated properties is:
- Raman Spectroscopy (A) is related to changes in Polarizability (I).
- FTIR Spectroscopy (B) is related to changes in Dipole Moment (II).
- UV-Visible Spectroscopy (C) measures Absorbance (III).
- NMR Spectroscopy (D) utilizes nuclear Spin (IV).
This corresponds to the matching (A)-(I), (B)-(II), (C)-(III), (D)-(IV).
Important Questions from Miscellaneous
- Which of the following scheduler/schedulers is/are also called CPU scheduler ?
(A). Short Term Scheduler
(B). Long Term Scheduler
(C). Medium Term Scheduler
(D). Asymmetric Scheduler
Choose the correct answer from the options given below: - A situation where two or more processes are blocked, waiting for resources held by each other is called:
- External fragmentation occurs ________.
- Which disk scheduling algorithm looks for the track closest to the current head position?
- Which CPU scheduling algorithm prefers the process with the shortest burst time?
