Ques 1.

Why is an electromagnetic radiation called so? Describe its characteristic parameters alongwith the units of measurement

Ques 2.

How is UV spectrum different in vapour phase from that in solution phase and why? Illustrated your answer.

Ques 3.

A 500 cm3 solution containing 33.5 mg of potassium permanganate in a cuvette with a path length of 2 cm show a transmittance at 450 m. If the percentage transmittance is observed to be 10, calculate the molar absorpturity of potassium parmangnate.

Ques 4.

What is the significance of selection rules for the vibrational spectroscopy? Describe the types of signals obtained in the vibration spectrum of a diatomic molecule.

Ques 5.

Why is the handling of samples for IR spectra measurements is not simple? Describe the sampling of solids for IR spectral measurements.

Ques 6.

Differentiate between IR spectra and Raman spectra.

Ques 7.

Describe the phenomena of fluorescence and phosphorescence using the Jablonski diagram.

Ques 8.

What is meant by fluorescence quenching? Explain the mechanism responsible for the quenching?

Ques 9.

How is determined as atmospheric pollutants by fluorimetry? Describe the method

Ques 10.

Describe in brief the basic principles involved in atomic absorption spectrometry (AAS) atomic emission spectrometry (AES) and atomic fluorescence spectrometry (AFS).

Ques 11.

Describe the processes that occur in the flame during a flame photometric experiment.

Ques 12.

What is the advantage of Stokes fluorescence? Explain taking an example and illustrate your answer.

Ques 13.

What is the reason of nonlinearity in the AAS plot? What other factors are responsible for this? Explain how these are resolved for an analyte.

Ques 14.

What is the difference between a premix nabuliser-burner and a total consumption burner? Give the advantage of flame atomization method.

Ques 15.

Describe plasma as used in AES. Give an example and write the principle of AEC based on plasma sources.

Ques 16.

Describe the application of AAS in the determination of toxic elements present as environmental contaminants.

Ques 17.

Explain the terms, magnetogyric ratio, spin flip, Fourier transformation, chemical shift and coupling constant.

Ques 18.

Draw the NMR spectra of methylisopropyl ketone showing the  values of all the photons.

Ques 19.

Taking a suitable example. Explain the fragmentation due to intermolecular rearrangement in mass spectrometry.

Ques 20.

Draw all the spectra possible for the molecule of benzoic acid indicating the peak values for each of the spectrum.