IGNOU MCHE 15 SOLVED ASSIGNMENT

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MCHE 15 2025 2026 - English

Tutor Marked Assignment

Advanced Kinetics and Electrochemistry (MCHE-015)

Course Code: MCHE-015

Assignment Code: MCHE-015/TMA/2026

Maximum Marks: 100

Note: Attempt all questions. The marks for each question are indicated against it.

1. (a) What are consecutive reactions? Derive an expression for the rate laws for intermediate formation and decay.

 

(b) Discuss the concept of autocatalysis. Explain with an example how autocatalytic behavior influences reaction rates.

 

2. (a) What are photochemical reactions? Outline the kinetic features of photochemical reactions.

 

(b) Define the steady-state approximation and explain its importance in the analysis of complex reactions with the help of a suitable example.

 

3. (a) Explain the mechanism of the Briggs-Rauscher oscillatory reaction. How does it differ from the Belousov-Zhabotinskii reaction?

 

(b) Explain the concept of rate laws for solid-state reactions and list the main factors affecting the rate of solid-state reactions.

 

4. (a) Explain Marcus theory for outer sphere electron transfer reactions. How does this theory account for the activation energy of an electron transfer reaction?

 

(b) Discuss the Michaelis-Menten mechanism for enzyme reactions. Derive the rate equation for the same and give its limitations.

 

5. (a) Outline the King-Altman method for analysing complex enzyme reactions and discuss its importance.

 

(b) Define impact parameter, collision cross-section, & reaction cross-section and discuss their importance in molecular reaction dynamics.

 

6. (a) Derive the Butler-Volmer equation for electrode kinetics and explain its significance.

 

(b) What is a Tafel plot? How is it obtained from the current-overpotential data?

 

7. (a) Explain the concept of a multistep electrode reaction pathway and give one of its examples.

 

(b) Discuss the role of the rate determining step in complex electrode reactions.

 

8. (a) What is coulometry? Differentiate between the controlled potential coulometry and controlled current coulometry.

 

(b) What are corrosion cells? Give the working principle of a corrosion cell with a simple diagram.

 

9. (a) Explain the working principle of any one corrosion prevention method, such as metallic coating, electrical protection, or corrosion inhibitors.

 

(b) What is a fuel cell? Write its basic working principle with a schematic representation.

 

10. (a) Explain the advantages and disadvantages of Lithium-Ion batteries with suitable examples.

 

(b) Describe the steps involved in the hydrogen evolution reaction (HER) at an electrode surface.

 

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