can someone please answer the following MCQ, thank you 14 Read the statements be
ID: 528753 • Letter: C
Question
can someone please answer the following MCQ, thank you
14 Read the statements below referring to 1H-NMR. Which ONE statement is NOT correct? A. The extent of the direct spin-spin interaction diminishes with distance. B. Microwaves are the type of radiation used to obtain NMR spectra. C. The chemical shift can depend upon the electronegativity of the atom to which the proton is chemically attached. D. The relaxation time is the time taken to dissipate the excess spin energy. 15. The intensity of the signals obtained in mass spectrometry depends on several factors. Among the factors given below chose the ONE that does NOT affect the intensity of the s lines A. Stability of the ion generated. B. Sensitivity of the detector. C. Temperature in the analyser. D. Type of ionisation. Give n the molecule 2-pentanone, which ONE of the following can originate from it by electron impact ionisation? A. 2-propenoll" and ethene through a McLafferty rearrangement. B. acetaldehyde] and propane. C. Propane and ethanol. D. Pentane and water. 17. Which ONE of the following are examples of spectroscopic signals A. Emission, resonance and fluorescence. B. Emission, absorption and fluorescence. C. Resonance, absorption and fluorescence. D. Emission, absorption and resonance. 18. Which ONE of the following is NOT indicative of the precision in a data set? A. Standard deviation B. Mean C. Confidence limits D. Relative standard deviationExplanation / Answer
14. (b)
Microwave radiation produces EPR spectra
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15.(c) temperature of the analyser
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16. b
acetaldehyde and propane
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17 (b) Emission, absorption and fluorescence
18. B
19. C
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