IGNOU MCH 3 SOLVED ASSIGNMENT 2026

Ques 1.

What is wave number? How is it related to wavelength?

Ques 2.

What is unpolarised light? How can it be polarised?

Ques 3.

Calculate the absorbance and transmittance of a 0.002 40 M solution of a substance having a molar absorptivity of 313 M¹ cm²¹ in a cell with a path length of 2.00 cm.

Ques 4.

The UV-VIS spectrum in gaseous phase is observed to be a band spectrum whereas in solution phase it is a smooth and continuous absorption peak. Explain.

Ques 5.

Discuss the factors responsible for the deviation from Lambert-Beer's law.

Ques 6.

What is the role of a detector in a spectrophotometer? Explain the principle of photomultiplier tube as a detector.

Ques 7.

Describe is KBr pelleting method for handling solid samples in IR spectroscopy.

Ques 8.

Calculate the number of vibrational modes for a molecule of methane.

Ques 9.

Explain the origin of Rayleigh and Raman lines with the help of an energy level diagram.

Ques 10.

Explain the origin of Rayleigh and Raman lines with the help of an energy level diagram.

Ques 11.

Discuss different modes of relaxation for an electronically excited molecule using the Jablonski diagram. 

Ques 12.

 Discuss different factors affecting fluorescence.

Ques 13.

 Discuss different factors affecting fluorescence.

Ques 14.

Discuss the fate of a sample introduced in the flame.

Ques 15.

Discuss the merits and demerits of Flame photometric method.

Ques 16.

 Enlist different pathways for atomic fluorescence emission and explain Stokes direct line fluorescence method.

Ques 17.

The choice of proper reagents and techniques of decomposition and dissolution of the sample is a critical step for the success of AAS determination. Explain the preparing sample for AAS using microwave digestion system.

Ques 18.

List the characteristics of an ideal atomization-excitation source.

Ques 19.

Draw a schematic layout of different components of an ICP-AES spectrometer and briefly state the role of each component.

Ques 20.

 Explain different relaxation mechanisms by which these operate to maintain population difference in nuclear spin states in NMR.

Ques 21.

What are isotopic peaks? Discuss the importance of isotopic peaks in mass spectrometry.

Ques 22.

 The important spectral details of an organic molecule having a molecular formula C4H8O are as follows:

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