Exam Details
| Subject | Spectroscopic methods | |
| Paper | ||
| Exam / Course | Post Graduate Diploma in Analytical Chemistry | |
| Department | School of Sciences (SOS) | |
| Organization | indira gandhi national open university | |
| Position | ||
| Exam Date | June, 2016 | |
| City, State | new delhi, |
Question Paper
Differentiate between reflection and refraction.
What are the two models of electromagnetic radiation Write the units of wavenumber and frequency.
Explain different types of electronic transitions involved in CHaCONH2 with the help of molecular orbital energy level diagram.
Draw a labelled sketch of the flame structure indicating its different zones.
Explain why tetramethyl silane is used as a standard in NMR.
Explain inductively coupled plasma (ICP).
Explain charge transfer spectrum of a transition metal complex species by taking a suitable example.
Differentiate between single beam and double beam spectrophotometers with the help of schematic diagrams.
Describe the sampling procedure for solid samples in IR spectrometry.
State and explain exclusion with the example. the rule help of of mutual a suitable
A 5 mM solution of nickel complex was taken in a 1 cm cuvette. The absorbance at ^max 590 nm was found to be 0.45. Calculate the molar absorptivity of the solution.
Explain the origin of phosphorescence and fluorescence with the help of Jablonski diagram. What are the possible spin states in a molecule?
Explain briefly the various factors affecting fluorescence and phosphorescence.
Define bioluminescence. Write the reactions involved in this process. How is this phenomenon used for research In medical field
Why do the phosphorimetric methods have limited applications in chemical analysis?
What is the role of atomizer in flame photometry Describe, in brief, the principle of total consumption burner.
What are the various types of interferences observed in quantitative determination by flame photometry Explain each of these briefly.
Explain the principle of atomic fluorescence spectrometry. What are its limitations?
Define nebulisation. Explain the fate of the sample in a flame.
Explain the basic principle of atomic absorption spectrophotometry and the relationship between the analyte concentration and absorption.
Discuss the use of organic solvent and microwave digestion in sample preparation in AAS determinations.
Describe the analytical methodology In ICP-AES. What are the causes of spectral interferences in ICP-AES
Draw Pascal's triangle. How is it useful in predicting relative intensities of split lines? Write the possible spin orientations due to three protons of methyl group.
Explain how the signals due to chemical shift are differentiated from those due to spin-spin splitting.
What are the prominent peaks observed in the mass spectrum of C6H5CH2CH3 other than molecular ion peaks
An organic compound with molecular formula C4H8O shows the following spectral characteristics
Mass spectrum shows a molecular ion peak at 72 and other fragmentation peaks at m/z 57, 43,29 and 15.
Intense absorption band at 290 nm in uv region.
Intense absorption band at 1720 and a broad band at 3000 cm^-1.
NMR spectrum shows a triplet at about 8 2.3 and a quartet 8 1.2. Also a singlet is observed in between.
Interpret all the observations by assigning all the peaks and identify the compound with detailed structure.
What are the two models of electromagnetic radiation Write the units of wavenumber and frequency.
Explain different types of electronic transitions involved in CHaCONH2 with the help of molecular orbital energy level diagram.
Draw a labelled sketch of the flame structure indicating its different zones.
Explain why tetramethyl silane is used as a standard in NMR.
Explain inductively coupled plasma (ICP).
Explain charge transfer spectrum of a transition metal complex species by taking a suitable example.
Differentiate between single beam and double beam spectrophotometers with the help of schematic diagrams.
Describe the sampling procedure for solid samples in IR spectrometry.
State and explain exclusion with the example. the rule help of of mutual a suitable
A 5 mM solution of nickel complex was taken in a 1 cm cuvette. The absorbance at ^max 590 nm was found to be 0.45. Calculate the molar absorptivity of the solution.
Explain the origin of phosphorescence and fluorescence with the help of Jablonski diagram. What are the possible spin states in a molecule?
Explain briefly the various factors affecting fluorescence and phosphorescence.
Define bioluminescence. Write the reactions involved in this process. How is this phenomenon used for research In medical field
Why do the phosphorimetric methods have limited applications in chemical analysis?
What is the role of atomizer in flame photometry Describe, in brief, the principle of total consumption burner.
What are the various types of interferences observed in quantitative determination by flame photometry Explain each of these briefly.
Explain the principle of atomic fluorescence spectrometry. What are its limitations?
Define nebulisation. Explain the fate of the sample in a flame.
Explain the basic principle of atomic absorption spectrophotometry and the relationship between the analyte concentration and absorption.
Discuss the use of organic solvent and microwave digestion in sample preparation in AAS determinations.
Describe the analytical methodology In ICP-AES. What are the causes of spectral interferences in ICP-AES
Draw Pascal's triangle. How is it useful in predicting relative intensities of split lines? Write the possible spin orientations due to three protons of methyl group.
Explain how the signals due to chemical shift are differentiated from those due to spin-spin splitting.
What are the prominent peaks observed in the mass spectrum of C6H5CH2CH3 other than molecular ion peaks
An organic compound with molecular formula C4H8O shows the following spectral characteristics
Mass spectrum shows a molecular ion peak at 72 and other fragmentation peaks at m/z 57, 43,29 and 15.
Intense absorption band at 290 nm in uv region.
Intense absorption band at 1720 and a broad band at 3000 cm^-1.
NMR spectrum shows a triplet at about 8 2.3 and a quartet 8 1.2. Also a singlet is observed in between.
Interpret all the observations by assigning all the peaks and identify the compound with detailed structure.
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Subjects
- Basic Analytical chemistry
- Electro analytical and Other methods
- Separation methods
- Spectroscopic methods