MCH-020 Solved Assignment 2026-27 in English | M.Sc Chemistry

The MCH-020 Solved Assignment 2026-27 in English is prepared for students of the M.Sc Chemistry programme studying MCH-020: Atomic and Molecular Spectroscopy. This digital PDF provides structured reference material for the applicable assignment questions and helps students organise their preparation effectively.

MCH-020 is part of the M.Sc Chemistry programme and focuses on important concepts related to atomic and molecular spectroscopy. The official IGNOU Programme Guide lists MCH-020 as a 4-credit theory course in Semester III of MSCCHEM.

The supplied assignment contains 10 main questions, with different sub-parts covering spectroscopy, quantum concepts, rotational and vibrational spectra, Raman spectroscopy, electronic spectroscopy, fluorescence, NMR, Mössbauer spectroscopy and ESR. The assignment carries a maximum of 100 marks.

MCH-020 Atomic and Molecular Spectroscopy Course Information

The official IGNOU prospectus places MCH-020 in the third semester of the M.Sc Chemistry programme and identifies it as a theory course carrying 4 credits.

MCH-020 Solved Assignment 2026-27 Overview

The MCH-020 Solved Assignment 2026-27 in English covers a wide range of advanced spectroscopy topics. The assignment begins with photon energy and Lambert’s Law before moving into orbital angular momentum, magnetic quantum numbers and the Stark effect.

The paper then covers photoelectron spectra, rotational spectroscopy, isotopic substitution, molecular vibration, anharmonic oscillators and Fermi resonance. These topics form an important part of the study of atomic and molecular spectra.

Raman spectroscopy also receives attention through calculations involving Stokes and anti-Stokes lines and an explanation of Coherent Anti-Stokes Raman Spectroscopy (CARS).

The later questions cover term symbols, HF molecular spectroscopy, fluorescence quenching, Nuclear Overhauser Effect, carbon-13 NMR, Mössbauer spectroscopy and ESR spectroscopy.

MCH-020 Assignment Questions

Course Code: MCH-020

Course Title: Atomic and Molecular Spectroscopy

Assignment Code: MCH-020/TMA/2026-27

Maximum Marks: 100

Instruction: Answer all the questions given below.

Question 1

a) A photon of violet light has a wavelength of 500 nm. Calculate its energy. (5)

b) State Lambert’s Law and translate it into a mathematical expression. (5)

Question 2

a) Explain the vector nature of orbital angular momentum. Predict the values of magnetic quantum number. With the help of a suitable diagram explain the concept of total angular momentum. (5)

b) What is Stark Effect? In which condition do we get linear Stark effect and quadratic Stark effect? (5)

Question 3

a) The given spectra show the relative positioning and intensity of the 2s peaks. Identify the statement that best explains the observation for Li and Be.

(5)

b) With the help of suitable diagrams explain the rotation of BF₃ molecule as an example of an oblate symmetric top molecule. (5)

Question 4

a) The first line in the rotational spectrum of HF molecule is observed at 60.22 cm⁻¹. Calculate the location of the band in DF molecule obtained by isotopic substitution of H atom in HF by D. Assume that there is no change in the bond length of the molecule. (5)

b) The oscillation frequency of ¹H³⁵Cl is determined to be 3660 cm⁻¹. Calculate the zero point energy and the force constant for the molecule. (5)

Question 5

a) What is meant by anharmonic oscillator? Apart from mechanical anharmonicity may arise? Why does it arise? With the help of a diagram show the allowed absorption transitions for an anharmonic oscillator according to the selection rule. (5)

b) What is meant by Fermi resonance? When are hot bands observed in transitions? Derive the expression for the frequency of a hot band under anharmonic conditions. (5)

Question 6

a) The Raman line for a substance was observed at 546.4 nm on irradiating with 322.4 nm radiation. Calculate the wave numbers of Stokes and anti-Stokes lines for the substance if the exciting line has a wavelength of 328.5 nm. (5)

b) Explain the coherent anti-Stokes Raman Spectroscopy (CARS) technique. Give suitable illustrations. (5)

Question 7

a) Illustrate the general procedure for determining the term symbols for (σg)¹ and (πu)³. (5)

b) The vibrational frequency and anharmonicity constant of HF molecule in an excited electronic state are found to be 3456.25 cm⁻¹ and 0.030 respectively. Calculate the dissociation energies, (De) and (D0) of the HF molecule in this excited state. (5)

Question 8

a) Explain the different mechanisms in fluorescence quenching. (5)

b)

(i) Describe the Nuclear Overhauser Effect (NOE) and its significance in structural elucidation using NMR. (2)

(ii) Predict the number of signals in ¹³C-NMR spectrum in the following compounds:

I. 2,3-Dimethylbuta-1,3-diene
II. Cyclohexanol
III. p-Xylene
IV. Ethylbenzene
V. But-1-ene
VI. Pyrrole

(3)

Question 9

a)

(i) Free Mössbauer nucleus ¹¹⁹Sn emits γ-radiation of frequency 5.76 × 10¹⁸ Hz. Calculate the recoil velocity and energy of the nucleus. (2)

(ii) For a system with an axially symmetric electric field gradient, derive the energy level scheme and determine the resulting quadrupole splitting for a transition from a ground state with spin Igr = 3/2 to an excited state with spin Iex = 5/2. (3)

b)

(i) The ESR spectrum of an organic radical containing two carbon atoms consists of 12 lines having relative intensities of 1,2,3,1,6,3,3,6,1,3,2 and 1. Identify the radical. (3)

(ii) Why does the g value in ESR spectroscopy become anisotropic in solid samples or molecules with low symmetry? (2)

Question 10

a) What is Nuclear Overhauser Effect (NOE)? How does it arise? (5)

b) In the ESR spectrum of K₃Mo(CN)₈, 25% isotopes of Mo show spin I = 5/2. Predict the pattern of lines around a central line from 75% non-magnetic isotope. (5)

What Does This MCH-020 Solved Assignment PDF Include?

The MCH-020 Solved Assignment 2026-27 in English provides structured reference answers for the questions included in the supplied assignment.

The material covers fundamental and advanced spectroscopy concepts, including photon energy, absorption laws, angular momentum, Stark effect, photoelectron spectroscopy and molecular rotation.

It also includes vibrational spectroscopy, anharmonicity, Raman spectroscopy, CARS, electronic term symbols, fluorescence, NMR, Mössbauer spectroscopy and ESR.

As a result, students can use one organised PDF to revise the major topics appearing in the assignment.

Key Features

• MCH-020 Atomic and Molecular Spectroscopy
• 2026–27 assignment preparation
• English Medium
• Complete assignment question coverage
• Structured reference answers
• Digital PDF format
• Instant download
• Mobile-friendly format
• Laptop and desktop compatible
• Useful for academic reference

Who Can Use the MCH-020 Assignment?

The MCH-020 Solved Assignment 2026-27 in English is intended for students enrolled in the M.Sc Chemistry programme under the MSCCHEM programme code.

IGNOU’s official Programme Guide places MCH-020 in Semester III and assigns it 4 theory credits.

Students should verify their course code, assignment session and medium before purchasing.

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Helpful Assignment Resources

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• Mother Publication Home
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Frequently Asked Questions

1. What is MCH-020?

MCH-020 is Atomic and Molecular Spectroscopy in the M.Sc Chemistry programme.

2. Which programme category should I select?

Select:

MSCCHEM

3. Which semester includes MCH-020?

MCH-020 belongs to Semester III of the M.Sc Chemistry programme.

4. How many credits does MCH-020 carry?

MCH-020 carries 4 theory credits.

5. What is the assignment code?

The supplied assignment gives the code as MCH-020/TMA/2026-27.

6. How many marks does the assignment carry?

The assignment carries a maximum of 100 marks.

7. How many main questions are included?

The assignment contains 10 main questions, with multiple sub-parts across the paper.

8. What topics are covered?

The assignment covers atomic and molecular spectroscopy, rotational spectroscopy, vibrational spectroscopy, Raman spectroscopy, fluorescence, NMR, Mössbauer spectroscopy and ESR.

9. Is this product available in English?

Yes. This product is prepared in English medium.

10. What format will I receive?

You will receive a digital PDF.

11. Can I access the PDF on mobile?

Yes. You can access the PDF on a smartphone, tablet, laptop or desktop computer.

12. Can I get a handwritten assignment hard copy?

Yes. Students who need a handwritten assignment hard copy can visit the Handwritten Assignment Hard Copy page.

Disclaimer

Mother Publication independently prepares this material for educational and reference purposes. Students should understand the content and prepare their assignments appropriately. Mother Publication is not affiliated with, endorsed by, or officially associated with IGNOU.

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