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ENSH 153Bachelor in Mechanical Engineering · Semester 23 Papers Available

Engineering Chemistry

Past examination question papers and complete curriculum syllabus for Engineering Chemistry (ENSH 153), Bachelor in Mechanical Engineering Semester 2 under Institute of Engineering (IOE), Tribhuvan University.

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Most Frequently Asked Questions

Top recurring IOE board exam questions for Engineering Chemistry with verified mark schemes, formula notation, and recurrence frequency.

Showing 30 of 30 top repeated questions

Electrochemistry and Buffer

5 Questions
#1Repeated 2 Times[5 Marks]Electrochemistry and Buffer
What is buffer capacity? Calculate the pH change in buffer solution made by mixing 150 ml of 0.5 M acetic acid and 450 ml of 0.1 M sodium acetate in which 10 ml of 0.2 M HCl is added. ($K_a = 1.8 \times 10^{-5}$).
Appeared in:2082 Shrawan2082 Baishakh
#2Repeated 2 Times[6 Marks]Electrochemistry and Buffer
Define electrochemical cell and standard electrode potential. What is the role of a salt bridge in a galvanic cell? Derive Nernst equation for a cell reaction and calculate the EMF of the cell $\text{Zn} | \text{Zn}^{2+}(0.01\text{ M}) || \text{Cu}^{2+}(0.1\text{ M}) | \text{Cu}$ at $25^\circ\text{C}$ ($E^\circ_{\text{cell}} = 1.10\text{ V}$).
Appeared in:2082 Shrawan2081 Bhadra
#3Repeated 2 Times[6 Marks]Electrochemistry and Buffer
What is corrosion of metals? Explain the electrochemical theory of rusting of iron with chemical reactions. Describe cathodic protection and sacrificial anode method for corrosion prevention.
Appeared in:2082 Baishakh2079 Baishakh
#4Repeated 1 Times[5 Marks]Electrochemistry and Buffer
What is meant by standard electrode potential? How does a galvanic cell differ from an electrolytic cell? Calculate the EMF of the cell at $25^\circ\text{C}$: $\text{Zn} \mid \text{Zn}^{2+}(0.1\text{ M}) \parallel \text{Fe}^{2+}(0.01\text{ M}) \mid \text{Fe}$ given $E^\circ_{\text{Zn}^{2+}/\text{Zn}} = -0.76\text{ V}$, $E^\circ_{\text{Fe}^{2+}/\text{Fe}} = -0.44\text{ V}$.
Appeared in:2082 Baishakh
#5Repeated 1 Times[5 Marks]Electrochemistry and Buffer
Define an electrochemical cell. What is the role of salt bridge in a voltaic cell? Calculate the EMF of the following cell: $\text{Mn} \mid \text{Mn}^{2+}(0.1\text{ M}) \parallel \text{Fe}^{2+}(1.0\text{ M}) \mid \text{Fe}$ when $E^\circ_{\text{Fe}^{2+}/\text{Fe}} = -0.44\text{ V}$ and $E^\circ_{\text{Mn}^{2+}/\text{Mn}} = -1.18\text{ V}$.
Appeared in:2082 Shrawan

Catalyst and Catalysis

4 Questions
#1Repeated 2 Times[5 Marks]Catalyst and Catalysis
What are homogeneous and heterogeneous catalysts? Describe the intermediate compound formation theory of catalysis with suitable examples.
Appeared in:2082 Baishakh2081 Bhadra
#2Repeated 2 Times[6 Marks]Catalyst and Catalysis
Differentiate between homogeneous and heterogeneous catalysis with examples. Explain the Intermediate Compound Formation Theory and Adsorption Theory of heterogeneous catalysis.
Appeared in:2082 Baishakh2081 Bhadra
#3Repeated 2 Times[5 Marks]Catalyst and Catalysis
Define enzyme catalysis and catalytic promoters/poisons. Explain the Michaelis-Menten mechanism and characteristics of enzyme-catalyzed reactions.
Appeared in:2082 Shrawan2078 Bhadra
#4Repeated 1 Times[5 Marks]Catalyst and Catalysis
Differentiate between negative catalysis and catalytic poisoning. How does a catalyst work and what is the role of a promoter?
Appeared in:2082 Shrawan

Analytical Techniques and their Applications

4 Questions
#1Repeated 2 Times[6 Marks]Analytical Techniques and their Applications
State and derive Beer-Lambert's law of spectrophotometry. Explain the principle and instrumentation of UV-Visible spectrophotometry and Flame Photometry.
Appeared in:2082 Baishakh2080 Bhadra
#2Repeated 2 Times[5 Marks]Analytical Techniques and their Applications
Explain the principle of High-Performance Liquid Chromatography (HPLC) and Gas Chromatography (GC). Mention their applications in environmental and pharmaceutical analysis.
Appeared in:2081 Bhadra2079 Bhadra
#3Repeated 1 Times[5 Marks]Analytical Techniques and their Applications
Describe the unimolecular nucleophilic substitution ($S_N1$) reaction in haloalkanes with suitable examples. What are the factors governing the mechanism of $S_N1$ and $S_N2$ reactions?
Appeared in:2082 Baishakh
#4Repeated 1 Times[5 Marks]Analytical Techniques and their Applications
Describe the mechanism of $E2$ elimination reaction with a suitable example. Give the differences between $E1$ and $E2$ reaction mechanisms.
Appeared in:2082 Baishakh

Metal Complexes, Rare Earth Elements and Metal alloys

6 Questions
#1Repeated 3 Times[5 Marks]Metal Complexes, Rare Earth Elements and Metal alloys
What are d-block elements? Why is Zn not considered to be a true transition element? Explain why transition elements exhibit variable oxidation states and form colorful compounds.
Appeared in:2082 Shrawan2082 Baishakh2081 Bhadra
#2Repeated 2 Times[3 Marks]Metal Complexes, Rare Earth Elements and Metal alloys
On the basis of Werner's theory, explain why $[\text{Co}(\text{NH}_3)_3\text{Cl}_3]$ does not give white precipitate with $\text{AgNO}_3$ but $[\text{Co}(\text{NH}_3)_6\text{Cl}_3]$ gives precipitate with $\text{AgNO}_3$ solution.
Appeared in:2082 Shrawan2082 Baishakh
#3Repeated 2 Times[5 Marks]Metal Complexes, Rare Earth Elements and Metal alloys
Explain the formation of $[\text{NiCl}_4]^{2-}$ and $[\text{Ni}(\text{CN})_4]^{2-}$ complex on the basis of VBT and predict their geometry and magnetic behaviour.
Appeared in:2082 Shrawan2082 Baishakh
#4Repeated 2 Times[5 Marks]Metal Complexes, Rare Earth Elements and Metal alloys
Explain the formation of $[\text{Fe}(\text{CN})_6]^{3-}$ and $[\text{FeF}_6]^{3-}$ complex ions using Valence Bond Theory (VBT). Why is $[\text{Fe}(\text{CN})_6]^{3-}$ low spin (inner orbital) while $[\text{FeF}_6]^{3-}$ is high spin (outer orbital)?
Appeared in:2083 Baishakh2082 Shrawan
#5Repeated 2 Times[5 Marks]Metal Complexes, Rare Earth Elements and Metal alloys
What is lanthanide contraction? What are its causes and consequences on atomic/ionic radii, basicity of hydroxides, and chemical separation of lanthanides?
Appeared in:2082 Baishakh2081 Bhadra
#6Repeated 2 Times[5 Marks]Metal Complexes, Rare Earth Elements and Metal alloys
What are metal alloys? Classify brass and bronze with their chemical compositions, properties, and engineering applications.
Appeared in:2082 Shrawan2079 Baishakh

Sustainable Chemistry

4 Questions
#1Repeated 3 Times[5 Marks]Sustainable Chemistry
How is ozone formed and depleted in nature? What are the consequences of depletion of ozone layer in the atmosphere?
Appeared in:2082 Shrawan2082 Baishakh2081 Bhadra
#2Repeated 3 Times[5 Marks]Sustainable Chemistry
What is water pollution? Write down its major sources, effects on mankind, and possible control measures.
Appeared in:2082 Shrawan2082 Baishakh2081 Bhadra
#3Repeated 2 Times[5 Marks]Sustainable Chemistry
Explain the 12 Principles of Green Chemistry with suitable industrial examples. Define atom economy and E-factor.
Appeared in:2082 Baishakh2081 Bhadra
#4Repeated 2 Times[5 Marks]Sustainable Chemistry
Discuss primary and secondary air pollutants. Explain the formation of Photochemical Smog and Acid Rain with their environmental impacts.
Appeared in:2082 Shrawan2078 Bhadra

Nanoscience and Nanotechnology

1 Question
#1Repeated 2 Times[5 Marks]Nanoscience and Nanotechnology
What are nanomaterials? Differentiate between top-down and bottom-up synthesis approaches. Explain the properties (optical, electrical, mechanical) and applications of Carbon Nanotubes (CNTs).
Appeared in:2082 Baishakh2081 Bhadra

Engineering Materials

3 Questions
#1Repeated 2 Times[5 Marks]Engineering Materials
What do you mean by inorganic polymers? Mention the applications of silicones in engineering field. Show your acquaintance with polymeric sulphur nitride.
Appeared in:2082 Shrawan2082 Baishakh
#2Repeated 2 Times[5 Marks]Engineering Materials
What is conducting polymer? Give the preparation and uses of Teflon and Nylon 6,6.
Appeared in:2082 Baishakh2081 Bhadra
#3Repeated 2 Times[5 Marks]Engineering Materials
What are conducting polymers? Explain the conduction mechanism in polyacetylene or polyaniline with doping mechanism. Mention their applications in flexible electronic devices.
Appeared in:2083 Baishakh2082 Shrawan

Explosives, Lubricants and Paints

3 Questions
#1Repeated 2 Times[5 Marks]Explosives, Lubricants and Paints
What are low and high explosives? Write the preparation and uses of TNT and TNG.
Appeared in:2082 Baishakh2081 Bhadra
#2Repeated 2 Times[5 Marks]Explosives, Lubricants and Paints
Define lubricants and mention their functions. What are the requisites of a good paint?
Appeared in:2082 Baishakh2081 Bhadra
#3Repeated 2 Times[5 Marks]Explosives, Lubricants and Paints
Classify lubricants based on physical state. Explain hydrodynamic (thick film) and boundary lubrication mechanisms. What are the constituents and functions of oil paints?
Appeared in:2082 Baishakh2080 Baishakh

Curriculum Syllabus & Course Topics

Sourced from TU curriculum portal
Full Syllabus (PDF)
Chapter-wise Units & Micro-Syllabus Topics (8 Units)

  1. 1. Electrochemistry and Buffer

    • 1.1Electrochemistry
    • 1.1.1Introduction
    • 1.1.2EMF of galvanic cell, Nernst equation
    • 1.1.3Polarization and overpotential
    • 1.1.4Butler-Volmer equation and Tafel plots
    • 1.2Electrode processes and mechanisms
    • 1.2.1Charge transfer processes at electrodes
    • 1.2.2Mass transfer and diffusion in electrochemical systems
    • 1.3Industrial and applied electrochemistry
    • 1.3.1Batteries: Lead acid and lithium ion
    • 1.3.2Solar-photovoltaic cell, fuel cell
    • 1.3.3Corrosion
    • 1.4Buffer, buffer range, buffer capacity and buffer solution and its applications

  2. 2. Catalyst and Catalysis

    • 2.1Definition and types
    • 2.2Design and criteria
    • 2.2.1Structure-activity relationships
    • 2.2.2Selection criteria of catalyst
    • 2.3Photocatalysis and electrocatalysis
    • 2.4Catalysis for energy and environmental applications
    • 2.4.1Catalytic conversion of fossil fuels
    • 2.4.2Renewable energy catalysts
    • 2.4.3Catalyst for pollution control

  3. 3. Analytical Techniques and their Applications

    • 3.1Chromatography
    • 3.2Mass spectroscopy
    • 3.3X-ray diffraction (XRD)
    • 3.4UV-visible spectroscopy
    • 3.5Infrared-spectroscopy (IR)
    • 3.6Nuclear magnetic resonance spectroscopy (NMR)

  4. 4. Metal Complexes, Rare Earth Elements and Metal alloys

    • 4.1Complexes
    • 4.1.1Introduction and Werner’s theory
    • 4.1.2Geometry of complex by VBT and its applications
    • 4.1.3Crystal field theory: Principle and applications
    • 4.2Rare earth elements: Introduction and applications
    • 4.3Metallic alloys and applications

  5. 5. Sustainable Chemistry

    • 5.1Green chemistry: Introduction and principles
    • 5.2Water chemistry
    • 5.2.1Importance of water quality standards
    • 5.2.2Degree of hardness, scale formation in boiler and softening of hard water
    • 5.2.3Water pollution with reference to turbidity, COD, BOD, heavy metals, radioactive substances, and plastic
    • 5.2.4Industrial wastewater and its treatment
    • 5.3Air pollution
    • 5.3.1Particulate matter, SOx, NOx, GHGs, VOCs, their impacts and remedies
    • 5.4Waste management
    • 5.4.1Segregation and management of solid waste
    • 5.4.2Management of biodegradable waste into energy
    • 5.4.3E-waste and its management

  6. 6. Nanoscience and Nanotechnology

    • 6.1Introduction and types of nano materials (0-, 1-, 2-, and 3- dimensional)
    • 6.2Nanoparticles, nanofibers, nanowires, carbon nanotubes, graphene, mxene, quantum dots, and their uses
    • 6.3Preparation of nanomaterials

  7. 7. Engineering Materials

    • 7.1Polymers
    • 7.1.1Natural and synthetic, organic and inorganic, conducting and non- conducting
    • 7.1.2Types of polymerizations: Addition and condensation polymerization
    • 7.1.3Preparation and applications of epoxy resin, polyurethane, Kevlar, polycarbonate, polymethyl methacrylate, polyacrylonitrile, silicones; phosphorus based polymer, sulphur based polymer
    • 7.1.4Conducting polymers: Synthesis and application
    • 7.1.5Composite: Fiber reinforced polymer
    • 7.1.6Natural polymers: Cellulose, chitin, chitosan, collagen
    • 7.2Cement: Hydration and setting chemistry of cement

  8. 8. Explosives, Lubricants and Paints

    • 8.1Explosives
    • 8.1.1Types of explosives: Primary, low and high explosives
    • 8.1.2Preparation and applications of TNT, TNG, Nitrocellulose and plastic explosives
    • 8.2Lubricants: Introduction, function and classification
    • 8.3Paints
    • 8.3.1Introduction, requisites, types and applications
    • 8.3.2Environmental and health impact

Examination Scheme & Marks Distribution

Evaluation Structure

  • Final Board Theory Exam: 60 Marks (Pass mark: 24)
  • Internal Assessment: 40 Marks (Pass mark: 16)
  • Practical / Lab Exam: 25 or 50 Marks (Continuous lab evaluation + viva, where applicable)

* This is the general current IOE 60/40 scheme; verify course-specific details in the syllabus above.

Exam Preparation Guidelines

  • Review the 3 available past examination papers to identify recurring patterns, core problem types, and chapter weightage.
  • Cross-reference key answers with official syllabus units, standard textbooks, and lecture notes.
  • Structure answers with labeled diagrams, concise bullet points, and highlight final answers in numerical solutions.

Frequently Asked Questions (Engineering Chemistry)

Q: How can I download Engineering Chemistry past question papers?

You can preview or download the Engineering Chemistry question papers (PDF) directly using the built-in viewer on this page with zero redirects or paywalls.

Q: What is the pass mark for Engineering Chemistry?

The general current scheme is a 60-mark final theory exam and a 40-mark internal assessment, with pass marks of 24 and 16. Verify the course-specific syllabus above.

Q: Where can I find the complete syllabus for this subject?

The available chapter-wise syllabus and topic breakdown is indexed in the Syllabus section above, with links to the curriculum PDF source.

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