Solved question paper for CHEMISTRY May-2023 (B-TECH 1st-2nd)

Solved Question Paper

Engineering chemistry May-2023

PTU • B-TECH • Information Technology • 1st-2nd • May-2023

engineering chemistry previous year question papers on BRpaper are organized for students of Punjab Technical University’s Bachelor of Technology program, 1st-2nd semester. This section makes it easier to browse subject-wise old question papers for engineering chemistry, so students can review how questions are typically framed in past exams and get a sense of the exam pattern. Many students search for engineering chemistry previous year question paper while preparing for exams, and this page is built to support exactly that kind of subject-wise browsing and revision. BRpaper is not the official website of Punjab Technical University or any institution, and it does not publish official notices or academic updates.

PART A

1. Spectroscopy and its Applications:

An introduction UV/Visible Spectroscopy: Selection rules; Line widths and intensity of spectral lines; Principle and instrumentation; Electronic Transitions; Chromophores & auxochromes; Factors affecting λMax & intensity of spectral lines; Franck-Condon principle; Applications. IR Spectroscopy: Principle and instrumentation; Vibrational frequency; Fundamental modes of vibrations and types; Anharmonics; Factors affecting vibrational frequency; Applications. NMR Spectroscopy: Principle & instrumentation; Chemical shift; Spin-Spin Splitting; High-resolution NMR spectrum (PMR only). (7)

2. Photochemistry:

Introduction; Photo-physical & photochemical processes; Light sources in photochemistry; Beer-Lambert Law; Laws of Photochemistry; Quantum yield (primary and overall); Primary and secondary photochemical reactions; Jablonski diagram; Semiconductor photochemistry, Photovoltaic cells, Introduction to optical sensors, Introduction to supra-molecular photochemistry. (5)

3. Water and its Treatment:

Boiler feed water: Specification, Scales and sludge fermentation; Priming & foaming; Different methods of the water purifications and softening; Desalination of water; Water for domestic use: Specification; Disinfection of water.

4. Green Chemistry and its Applications:

Introductory overview - Definition and concepts of Green chemistry; Emergence of Green chemistry; Twelve principles of Green Chemistry with emphasis on the use of alternative feedstock (biofuels); Use of innocuous reagents in natural processes; Alternative solvents; Design of the safer chemicals; Designing alternative reaction methodology. Microwave and ultrasonic radiation in Green synthesis - Minimizing energy consumption. (4)

PART B

5. Corrosion and its Prevention:

Introduction; Different types of corrosion - Wet and Dry corrosion; Different types of surface films; Mechanisms of wet corrosion; Galvanic corrosion; Galvanic Series; Concentration cell corrosion and differential aeration corrosion; Soil and microbial corrosions; waterline, stress corrosions; Various methods of corrosion control. (5)

6. Polymers and Reinforced Composites:

Introduction; Functionality; Types of polymerization; Specific features of polymers; Structures - regularity and irregularity; Tacticity of polymers; Average molecular weights and size; Determination of molecular weight by number average method; Effect of molecular weight on the properties of polymers; Introduction to polymer reinforced composite. (5)

7. Nanochemistry:

Introduction; Materials self-assembly; Molecular vs. materials self-assembly; Self-assembling materials; Two-dimensional assemblies; Mesoscale self-assembly; Coercing colloids; Nanocrystals; Supramolecular structures; Nanoscale materials; Future perspectives. (5)

8. Petrochemicals:

Introduction; First, second & third generation petrochemicals; Primary Raw Materials for Petrochemicals. Natural gas: Natural gas treatment processes; Natural gas liquids; Properties of natural gas; Crude oil: Composition of crude oil- Hydrocarbon compounds; Non-hydrocarbon compounds; Metallic Compounds, Crude oil classification; Physical separation processes; Conversion processes; Production of ethylene and propylene

Question papers (year-wise) Solutions

Solved Questions

Solved

Write briefly: a) Cause of chemical shift in NMR.

Very Short Answer 2 Marks May-2023 • PTU B-TECH

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Dec 2009 Cause of chemical shift in NMR.
Write briefly: b) Difference between Galvanic cell and Electrolytic cell.

Very Short Answer 2 Marks May-2023 • PTU B-TECH

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Dec 2009 Difference between Galvanic cell and Electrolytic cell.
Write briefly: c) Cause of alkalinity of raw water.

Very Short Answer 2 Marks May-2023 • PTU B-TECH

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Write briefly: d) Advantages and limitations of lime soda process.

Very Short Answer 2 Marks May-2023 • PTU B-TECH

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Write briefly: e) Define Nanomaterials.

Very Short Answer 2 Marks May-2023 • PTU B-TECH

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Write briefly: f) Write down the formulae of Average molecular weight.

Very Short Answer 2 Marks May-2023 • PTU B-TECH

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Write briefly: g) Give an example of second generation perrtrochemicals.

Very Short Answer 2 Marks May-2023 • PTU B-TECH

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Write briefly: h) What are self Assembling materials?

Very Short Answer 2 Marks May-2023 • PTU B-TECH

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Write briefly: i) What type of primary raw material is used for petrochemicals?

Very Short Answer 2 Marks May-2023 • PTU B-TECH

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Dec 2018 What can be made from petrochemicals?

May 2017
What are the primary raw materials for petrochemical industry? How can the primary raw material be converted to usable secondary and tertiary petrochemical products?

May 2016 What are petrochemicals? What are the primary raw materials for petrochemicals?
Write briefly: j) Write down the formula for calculating Atom Economy.

Very Short Answer 2 Marks May-2023 • PTU B-TECH

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a) Distinguish between: i) Thermal and photochemical reactions ii) Fluorescence and phosphorescence

Long Answer 8 Marks May-2023 • PTU B-TECH

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May 2015 Distinguish between photophysical and photochemical process.

Dec 2015 Distinguish between thermal and photochemical reactions.

Dec 2012 Distinguish between photochemical and thermal reactions.

May 2005 Distinguish between Thermal and photochemical reactions.
b) The quantum efficiency of photochemical reaction:
H2 (g) + Cl2 (g) 4 2HCl(g)
Is 1.0 x 10^6 with wave length of 480nm. Calculate the number of moles of HCl(g) produced per joule of radiant energy absorbed.

Long Answer 8 Marks May-2023 • PTU B-TECH

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May 2012 Calculate the number of moles of HCl(g) produced by absorption of one joule of radiant energy of wavelength 480 nm in the following reaction, if the quantum yield of photochemical reaction is 1.0 × 10 6. H2(g) + Cl2(g) → 2HCl(g)

May 2005 The quantum efficiency of photochemical reaction: H2(g) + Cl2(g) → 2HCl(g) is 1.0 x 10^6 with wavelength of 480 nm. Calculate the number of moles of HCl(g) produced per joule of radiant energy absorbed.
a) Define following terms i) Atom Economy ii) Green Chemistry iii) Bio-Catalysis

Long Answer 8 Marks May-2023 • PTU B-TECH

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b) Give different way to minimise Hazardous waste.

Long Answer 8 Marks May-2023 • PTU B-TECH

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Write a detailed note on the construction, working and chemistry behind the photovoltaic cell.

Long Answer 8 Marks May-2023 • PTU B-TECH

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Dec 2018 What is photovoltaic cell?

Dec 2017
Write a detailed note on construction, working and chemistry behind photovoltaic cell.

May 2014 Explain photovoltaic cells.

Dec 2011 Describe photovoltaic cells.
a) Calculate the amount of lime (84% pure) and Soda (92% pure) required for treatment of 20,000 liters of water, whose analysis is as follows Ca(HCO3)2 = 40.5 ppm; Mg(HCO3)2 = 36.5 ppm; MgSO4 = 30.00 ppm; CaSO4 = 34.0 ppm; CaCl2 = 27.75 ppm and NaCl = 10.00 ppm. Also calculate the temporary and permanent hardness of water.

Long Answer 8 Marks May-2023 • PTU B-TECH

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May 2020 Calculate the amount of lime (84% pure) required for treatment of 20,000 liters of water whose analysis is: Ca(HCO3)2 = 40.5 ppm; Mg(HCO3)2 = 36.5 ppm; MgSO4 = 30.00 ppm; CaSO4 = 34.0 ppm; CaCl2 = 27.75 ppm; NaCl = 10.00 ppm. Also calculate the temporary hardness of water.

May 2020 Calculate the amount of soda (92% pure) required for treatment of 20,000 liters of water whose analysis is: Ca(HCO3)2 = 40.5 ppm; Mg(HCO3)2 = 36.5 ppm; MgSO4 = 30.00 ppm; CaSO4 = 34.0 ppm; CaCl2 = 27.75 ppm; NaCl = 10.00 ppm. Also calculate the permanent hardness of water.

May 2007 Calculate the amount of lime (84% pure) and soda (92% pure) required for treatment of 20,000 litres of water whose analysis is as follows: Ca(HCO3)2 = 40.5 ppm; Mg(HCO3)2 = 36.5 ppm; MgSO4 = 30 ppm; CaSO4 = 34 ppm; CaCl2 = 27.75 ppm; NaCl = 10 ppm. Also calculate temporary and permanent hardness of water sample. [Given atomic masses of H = 1, Na = 23, Ca = 40, Mg = 24, O = 16, C = 12, S = 32, Cl = 35.5]

Dec 2006 Calculate the amount of lime (84% pure) and soda (92% pure) required for treatment of 20,000 litres of water whose analysis is as follows: Ca(HCO3)2 = 40.5 ppm; Mg(HCO3)2 = 36.5 ppm; MgSO4 = 30 ppm; CaSO4 = 34 ppm; CaCl2 = 27.75 ppm; NaCl = 10 ppm. Also calculate temporary and permanent hardness of water sample.

Dec 2005 Calculate the amount of lime (84% pure) and soda (92% pure) required for treatment of 20,000 liters of water, whose analysis is as follows Ca(HCO3)2 = 40.5 ppm; Mg(HCO3)2 = 36.5 ppm; MgSO4 = 30.00 ppm; CaSO4 = 34.0 ppm; CaCl2 = 27.75 ppm and NaCl = 10.00 ppm. Also calculate the temporary and permanent hardness of water.

b) Describe method involved in the treatment of water required for industries.

Long Answer 8 Marks May-2023 • PTU B-TECH

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Dec 2009 Describe method involved in treatment of water required for industries.
a) Discuss the importance of design and material selection in controlling corrosion.

Long Answer 8 Marks May-2023 • PTU B-TECH

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Dec 2019 Discuss briefly about differential aeration corrosion.

May 2013 Explain the protective measures of controlling corrosion.

May 2013 Discuss atmospheric corrosion.

May 2012 Discuss metal alloys for corrosion control.

May 2012 Discuss anodic and cathodic coating for corrosion control.

Dec 2012 Discuss differential aeration corrosion.

May 2007 Discuss the importance of design and material selection in controlling corrosion.

May 2007 Discuss briefly: Stress corrosion

Dec 2007 Describe various methods employed for protection of metals from corrosion.

Dec 2006 Discuss the importance of design and material selection in controlling corrosion.

Dec 2006 Discuss briefly Stress corrosion.
b) Discuss briefly: i) Galvanic corrosion ii) Stress corrosion

Long Answer 8 Marks May-2023 • PTU B-TECH

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c) Why does steel not rust if covered with ice?

Long Answer 8 Marks May-2023 • PTU B-TECH

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May 2007 Why steel does not rust if covered with ice?

Dec 2006 Why steel does not rust if covered with ice?
b) How does molecular weight affect the properties of polymer?

Long Answer 8 Marks May-2023 • PTU B-TECH

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May 2020 How does molecular weight affect the properties of polymer?

Dec 2016 Describe the effect of molecular weight on the properties of polymers.

May 2013 Discuss the effect of molecular weight on properties of polymers.
a) What are different types of polymerization reactions? Give examples

Long Answer 8 Marks May-2023 • PTU B-TECH

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May 2020 What are different types of polymerization reactions? Give examples.

May 2016 What is polymerization?

May 2015 What is Polymerization? Discuss various types of polymerization.

May 2014 What is polymerization? Describe the types of polymerization.

May 2012 What is polymerization? Discuss its types.

Dec 2011 What is meant by polymerization?
Write a short note on the following: d) Coercing colloids

Long Answer 8 Marks May-2023 • PTU B-TECH

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Write a short note on the following: c) Supermolecular structure

Long Answer 8 Marks May-2023 • PTU B-TECH

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Write a short note on the following: b) Nanoscale material

Long Answer 8 Marks May-2023 • PTU B-TECH

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Dec 2019 Write a detailed note on nanoscale materials.
Write a short note on the following: a) Two dimensional assemblies

Long Answer 8 Marks May-2023 • PTU B-TECH

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Dec 2018 Describe two dimensional assemblies.

Dec 2016 Describe two dimensional assemblies.
b) What is natural gas? Write down the properties of natural gas.

Long Answer 8 Marks May-2023 • PTU B-TECH

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May 2020 Write a short note on properties of natural gas.

Dec 2019 Write a note on properties of natural gas.

Dec 2014 What are the properties of natural gas?
a) Discuss the first, second and third generation petrochemicals.

Long Answer 8 Marks May-2023 • PTU B-TECH

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Dec 2023 What do you mean by first generation petrochemicals?

May 2018
What are petrochemicals?

Dec 2017
What is meant by first, second and third generation petrochemicals?

Dec 2016 What are third generation petrochemicals?

May 2014 Discuss various generations of petrochemicals.

Dec 2011 What are third generation petrochemicals?

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01 Where can I find engineering chemistry previous year question papers for Bachelor of Technology, 1st-2nd semester?

This page lists engineering chemistry question papers uploaded for Punjab Technical University Bachelor of Technology, 1st-2nd semester, organized for subject-wise browsing where available.

02 Are these official Punjab Technical University question papers?

BRpaper is not the official website of Punjab Technical University. These papers are shared for reference and revision purposes only and are not official university material.

03 How can previous year engineering chemistry papers help in exam preparation?

Reviewing past papers can help you understand how questions are typically framed, notice commonly repeated topics, and get a sense of the exam pattern before your own exam.

04 What kind of topics does engineering chemistry usually cover?

The question papers here relate to the official engineering chemistry syllabus set by the university for this course and semester.

05 Does this page include a engineering chemistry previous year question paper or solved answers?

This page focuses on providing access to the previous year question papers themselves. A separate question bank or solved answers may not be available for every paper.

06 Can I find papers for other subjects in the same Bachelor of Technology?

Yes, BRpaper organizes papers by university, course, stream, and semester, so you can browse other subjects within the same Punjab Technical University Bachelor of Technology.

Solved question paper for CHEMISTRY May-2023 (B-TECH 1st-2nd)

Engineering chemistry May-2023

PART A

PART B

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