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Spectroscopy

21 questions · Chemistry · IIT JAM
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Spectroscopy

21 questions · Chemistry · IIT JAM

  1. The set of asymmetric top molecules is2025 · Q29 · MCQ
  2. The resonance frequency of ¹H nuclei is 300 MHz in an NMR spectrometer. If the spectrometer is operated at 12 T magnetic field, the resonance frequency (in MHz) of the same ¹H nuclei is ​.2025 · Q49 · Numerical
  3. The first rotational absorption of ¹²C¹⁶O molecule is observed at 3.84 cm⁻¹. If an isotopic substitution is made with ¹⁸O in the molecule, the frequency (in cm⁻¹) of first rotational absorption is ​.2025 · Q50 · Numerical
  4. If 1 M of a dye in water transmits 50% of incident light at 400 nm, then 2 M of the dye in water transmits ​ % of the incident light at 400 nm. (rounded off to the nearest integer) [Given: Both experiments are…2024 · Q54 · Numerical
  5. The harmonic vibrational frequency of a diatomic molecule is 2000 cm⁻¹. Its zero-point energy is ​ eV.2023 · Q55 · Numerical
  6. The spacing between successive rotational energy levels of a diatomic molecule XY and its heavier isotopic analogue X'Y' varies with the rotational quantum number, J, as2022 · Q23 · MCQ
  7. Two close lying bands in a UV spectrum occur at 274 nm and 269 nm. The magnitude of the energy gap between the two bands is ​ cm^{-1}. *(round off to the nearest integer)*2022 · Q57 · Numerical
  8. The CORRECT statement regarding the molecules BF 3​ and CH 4​ is2021 · Q29 · MCQ
  9. The intensity of a monochromatic visible light is reduced by 90% due to absorption on passing through a 5.0 mM solution of a compound. If the path length is 4 cm, then the molar extinction coefficient of the compound in M⁻¹ cm⁻¹ is ​…2021 · Q53 · Numerical
  10. The separation of energy levels in the rotational spectrum of CO is 3.8626 cm −1. The bond length (assume it does not change during rotation) of CO in Å (rounded off to two decimal places) is ​. (Given:…2021 · Q55 · Numerical
  11. The force constant for H35Cl and D35Cl are the same and both can be considered as harmonic oscillators. H35Cl has a fundamental vibrational transition at 2886 cm−1. The…2020 · Q12 · MCQ
  12. At a certain wavelength, liquid P transmits 70%, whereas liquid Q transmits 30% of the incident light when separately placed in a spectrophotometric cell (path length = 1 cm). In a binary mixture of liquids P and Q (assume non-interacting…2020 · Q55 · Numerical
  13. The correct option for the number of bending modes of vibration in each of H2​O, CS2​ and SO2​ molecules, respectively, is2019 · Q12 · MCQ
  14. The number of vibrational mode(s) of a carbon dioxide molecule that can be detected using infrared spectroscopy is2019 · Q3 · MCQ
  15. Among the following, microwave active molecule(s) is/are2019 · Q33 · Multiple correct
  16. The magnetic field strength required to excite an isolated proton to its higher spin state with an electromagnetic radiation of 300 MHz is ​ Tesla (T). (Round off to two decimal places) [Magnetogyric ratio of…2019 · Q44 · Numerical
  17. For H 2​ molecule, the fundamental vibrational frequency (υˉe​) can be taken as 4400 cm −1. The zero-point energy of the molecule is ​ kJ mol −1 (rounded up to two decimal places). [h =…2018 · Q58 · Numerical
  18. IR active molecule(s) is/are2017 · Q38 · Multiple correct
  19. The number of normal modes of vibration in naphthalene is2017 · Q8 · MCQ
  20. The correct order of the fundamental vibrational frequencies of the following diatomic molecules is2015 · Q28 · MCQ
  21. The magnetic field (in Tesla) required for flipping a 1 H nucleus in an NMR spectrometer operating at 400 MHz is ​ [Given: γ=2.67×108 T −1 s −1, π=3.14]2015 · Q54 · Numerical