Solved question paper for CHEMISTRY May-2020 (B-TECH 1st-2nd)

Solved Question Paper

Engineering chemistry May-2020

PTU • B-TECH • Mechanical Engineering • 1st-2nd • May-2020

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

How many signals would you expect to see in the ¹H NMR spectrum of the following compounds?

Short Answer 2 Marks May-2020 • PTU B-TECH

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May 2020 How many NMR signals are observed in the spectrum of CH3-CH2-CH2CH3?

Dec 2019 How many signals would you expect to see in the 1H NMR spectrum of the following compound?

Dec 2018
How many signals would you expect to see in the ¹H NMR spectrum of the following :
\r\n\r\n
CH₃CH₂CH₂CH₃ $\"\"$

Dec 2008 Indicate the number and type of 1H-NMR signals expected in CH3-CH=CH2.

Dec 2005 How many NMR signals are observed in the spectrum of CH3-CH2-◊-CH2CH3?

Dec 2005 How many NMR signals are observed in the spectrum of CH3CH2CH3?
How are salts responsible for the temporary and permanent hardness of water? Explain.

Short Answer 2 Marks May-2020 • PTU B-TECH

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May 2017
SECTION-A

1. Write briefly :
a) Explain temporary and permanent hardness of water.

May 2013 What salts are responsible for temporary and permanent hardness of water?

May 2012 Explain temporary and permanent hardness of water.

Dec 2012 Name the salts responsible for temporary and permanent hardness of water.

May 2011 What salts are responsible for temporary and permanent hardness of water?

Dec 2011 Explain degree of hardness of water.

Dec 2008 How are salts responsible for the temporary and permanent hardness of water? Explain.
State Beer-Lambert Law.

Short Answer 2 Marks May-2020 • PTU B-TECH

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Dec 2011 State Beer–Lambert law.
What are concentration cells?

Short Answer 2 Marks May-2020 • PTU B-TECH

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May 2013 Define concentration cells.

May 2012 Discuss the concentration cell.

May 2011 Discuss the concentration cells.

State the law of photochemical equivalence.

Short Answer 2 Marks May-2020 • PTU B-TECH

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May 2014 State the law of photochemical equivalence.

May 2008 Explain Stark-Einstein law of photochemical equivalence?

May 2007 State and explain Einstein’s law of photochemical equivalence.

Dec 2006 State and explain Einstein’s law of photochemical equivalence.
Define Atom Economy.

Short Answer 2 Marks May-2020 • PTU B-TECH

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Why does Mg(HCO3)2 require double amount of lime for softening?

Short Answer 2 Marks May-2020 • PTU B-TECH

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Dec 2014 Why does the Mg(HCO3)2 require double amount of lime for softening?

May 2007 Why does Mg(HCO3)2 require double amount of lime for softening?

Dec 2006 Why does Mg(HCO3)2 require double amount of lime for softening?
Define Molecular self Assembly.

Short Answer 2 Marks May-2020 • PTU B-TECH

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What is the importance of finger print region in IR spectroscopy?

Short Answer 2 Marks May-2020 • PTU B-TECH

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May 2022 What is the importance of ‘finger print region’ in infrared spectroscopy?

May 2007 What is the importance of IR spectroscopy in fingerprint region?

Dec 2007 What is the importance of IR spectroscopy in the fingerprint region?

Dec 2006 What is the importance of IR spectroscopy in finger print region?
Why does iron not rust when zinc coating is broken in a galvanized iron pipe, but rusting occurs if a coating of tin over iron is broken?

Short Answer 2 Marks May-2020 • PTU B-TECH

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Dec 2007 Iron does not rust when zinc coating is broken in a galvanized iron pipe but rusting occurs if a coating of tin over iron is broken. Why?
Explain any two principles of Green Chemistry with the help of examples.

Long Answer 5 Marks May-2020 • PTU B-TECH

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Dec 2023 Define Green chemistry.

May 2019 Write in brief about emergence of Green Chemistry.

May 2017
Define Green Chemistry. What are its applications?

May 2016 Define Green Chemistry. Explain the differences between traditional approach to reduce pollution and the Green chemistry approach.

May 2015 What do you mean by green chemistry? Briefly explain atom economy.

Dec 2014 Explain any three principles of green chemistry with examples.

May 2013 Explain Green chemistry and its concepts.

May 2012 What is Green Chemistry? Why is it called so?

Dec 2011 Define Green Chemistry.
Elaborate the statement: "Microwave heating as a Greener Technology".

Short Answer 3 Marks May-2020 • PTU B-TECH

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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.

Long Answer 4 Marks May-2020 • PTU B-TECH

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May 2023 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.

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.
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.

Long Answer 4 Marks May-2020 • PTU B-TECH

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May 2023 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.

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 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.
What are lime and soda processes?

Short Answer 4 Marks May-2020 • PTU B-TECH

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Compare hot and cold soda lime process for softening of hard water.

Short Answer 4 Marks May-2020 • PTU B-TECH

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Dec 2015 Explain the cold lime-soda process for the removal of hardness of water and give the difference between cold and hot lime-soda process.

May 2007 What are lime and soda? Compare hot and cold soda lime process for softening of hard water.

Dec 2006 What are lime and soda? Compare hot and cold soda lime process for softening of hard water.

How do you distinguish between different types of transitions involved in UV-Vis spectroscopy?

Short Answer 4 Marks May-2020 • PTU B-TECH

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May 2020 Explain principles of UV-Vis spectroscopy. How do you distinguish between different types of transitions involved in UV-Vis spectroscopy?

Dec 2008 How do you distinguish between different types of transitions involved in UV-VIS spectrophotometry?
How many NMR signals are observed in the spectrum of CH3COOCH3?

Short Answer 4 Marks May-2020 • PTU B-TECH

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May 2020 How many NMR signals are observed in the spectrum of CH3O0CH3?

Dec 2005 How many NMR signals are observed in the spectrum of CH3COOCH3?

Dec 2005 How many NMR signals are observed in the spectrum of CH3OCH3?
How many NMR signals are observed in the spectrum of CH3-CH2-CH2CH3?

Short Answer 4 Marks May-2020 • PTU B-TECH

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May 2020 How many signals would you expect to see in the ¹H NMR spectrum of the following compounds?

Dec 2019 How many signals would you expect to see in the 1H NMR spectrum of the following compound?

Dec 2018
How many signals would you expect to see in the ¹H NMR spectrum of the following :
\r\n\r\n
CH₃CH₂CH₂CH₃ $\"\"$

Dec 2008 Indicate the number and type of 1H-NMR signals expected in CH3-CH=CH2.

Dec 2005 How many NMR signals are observed in the spectrum of CH3-CH2-◊-CH2CH3?

Dec 2005 How many NMR signals are observed in the spectrum of CH3CH2CH3?
How many NMR signals are observed in the spectrum of CH3O0CH3?

Short Answer 4 Marks May-2020 • PTU B-TECH

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May 2020 How many NMR signals are observed in the spectrum of CH3COOCH3?

Dec 2005 How many NMR signals are observed in the spectrum of CH3COOCH3?

Dec 2005 How many NMR signals are observed in the spectrum of CH3OCH3?

Draw a well labelled Jablonski diagram and explain intersystem crossing.

Short Answer 2 Marks May-2020 • PTU B-TECH

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Dec 2014 Draw a well labeled Jablonski diagram and explain intersystem crossing.

Dec 2014 Draw a well labelled Jablonski diagram and explain intersystem crossing.
Draw a well labelled Jablonski diagram and explain phosphorescence.

Short Answer 2 Marks May-2020 • PTU B-TECH

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May 2020 Draw a well labelled Jablonski diagram and explain fluorescence.

May 2013 Explain the concept of fluorescence and phosphorescence with the help of well labelled Jablonski diagram.
Draw a well labelled Jablonski diagram and explain fluorescence.

Short Answer 2 Marks May-2020 • PTU B-TECH

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May 2020 Draw a well labelled Jablonski diagram and explain phosphorescence.

May 2013 Explain the concept of fluorescence and phosphorescence with the help of well labelled Jablonski diagram.
A solution shows a transmittance of 20% when taken in a cell of 2.5 cm thickness. Calculate its concentration, if the molar absorption coefficient is 12,000 dm³ mol⁻¹ cm⁻¹.

Short Answer 2 Marks May-2020 • PTU B-TECH

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May 2005 A solution shows a transmittance of 20% when taken in a cell of 2.5 cm thickness. Calculate its concentration, if the molar absorption coefficient is 12,000 dm3 mol-1 cm-1.

Explain the mechanism of galvanic corrosion.

Short Answer 2 Marks May-2020 • PTU B-TECH

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May 2020 Explain the mechanism of wet corrosion.

May 2019 Discuss the chemistry and mechanism of wet corrosion.

Dec 2018 Discuss the mechanism of wet corrosion.

Dec 2017
Explain the mechanism of electrochemical corrosion with example.

May 2016 What is corrosion? Explain electrochemical theory of corrosion.

May 2016 Explain differential metal corrosion.

Dec 2016 Explain differential aeration corrosion.

Dec 2016 Give the cause of corrosion.

May 2015 Explain waterline corrosion.

May 2015 Explain stress corrosion.

May 2015 Explain the mechanism of electrochemical corrosion.

Dec 2015 Describe sacrificial anodic method for corrosion prevention with an example.

May 2014 Define corrosion. Discuss the mechanism of wet corrosion.

May 2012 Explain the mechanism of wet corrosion.

Dec 2012 Describe the mechanism of electrochemical corrosion.

Dec 2012 Explain dry corrosion.

Dec 2012 Describe the mechanism of electrochemical corrosion.

May 2011 Discuss the mechanism of wet corrosion.

Dec 2011 Discuss mechanism of wet corrosion.

May 2008 What is corrosion of metals? Explain electro-chemical corrosion with its mechanism.

Dec 2008 Explain the type of corrosion with evolution of hydrogen ions.

May 2007 Discuss briefly: Galvanic corrosion

Dec 2007 Explain briefly galvanic cell corrosion.

Dec 2007 Explain briefly pitting corrosion.

Dec 2006 Discuss briefly Galvanic corrosion.
Explain the mechanism of wet corrosion.

Short Answer 2 Marks May-2020 • PTU B-TECH

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May 2020 Explain the mechanism of galvanic corrosion.

May 2019 Discuss the chemistry and mechanism of wet corrosion.

Dec 2018 Discuss the mechanism of wet corrosion.

Dec 2017
Explain the mechanism of electrochemical corrosion with example.

May 2016 What is corrosion? Explain electrochemical theory of corrosion.

May 2016 Explain differential metal corrosion.

Dec 2016 Explain differential aeration corrosion.

Dec 2016 Give the cause of corrosion.

May 2015 Explain waterline corrosion.

May 2015 Explain stress corrosion.

May 2015 Explain the mechanism of electrochemical corrosion.

Dec 2015 Describe sacrificial anodic method for corrosion prevention with an example.

May 2014 Define corrosion. Discuss the mechanism of wet corrosion.

May 2012 Explain the mechanism of wet corrosion.

Dec 2012 Describe the mechanism of electrochemical corrosion.

Dec 2012 Explain dry corrosion.

Dec 2012 Describe the mechanism of electrochemical corrosion.

May 2011 Discuss the mechanism of wet corrosion.

Dec 2011 Discuss mechanism of wet corrosion.

May 2008 What is corrosion of metals? Explain electro-chemical corrosion with its mechanism.

Dec 2008 Explain the type of corrosion with evolution of hydrogen ions.

May 2007 Discuss briefly: Galvanic corrosion

Dec 2007 Explain briefly galvanic cell corrosion.

Dec 2007 Explain briefly pitting corrosion.

Dec 2006 Discuss briefly Galvanic corrosion.
What are the various methods that need to be followed to control corrosion?

Short Answer 4 Marks May-2020 • PTU B-TECH

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Dec 2023 What do you understand by wet and dry corrosion? How the corrosion can be prevented?

May 2022 What are the different methods of controlling corrosion? Explain sacrificial anodic protection method.

Dec 2018 How corrosion can be prevented by proper designing?

May 2014 What are the protective measures against corrosion? Discuss.
What are different types of polymerization reactions? Give examples.

Short Answer 4 Marks May-2020 • PTU B-TECH

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May 2023 a) 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?

How does molecular weight affect the properties of polymer?

Short Answer 4 Marks May-2020 • PTU B-TECH

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May 2023 b) 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.
Write a short note on classification of crude oil.

Short Answer 4 Marks May-2020 • PTU B-TECH

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May 2022 What is the composition of crude oil? Also, classify the crude oil in different categories.

May 2019 How will you classify crude oil?

May 2019 Describe the composition of crude oil, emphasising on hydrocarbon and non-hydrocarbon components present in it.

Dec 2018 What is the composition of crude oil? Discuss various petroleum products that come from crude oil.

Dec 2016 Describe the composition of crude oil.

May 2015 What is crude oil? Give composition and classification of crude oil.

Dec 2012 What is Crude Oil? Give its composition and classification.
Write a short note on properties of natural gas.

Short Answer 4 Marks May-2020 • PTU B-TECH

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May 2023 b) What is natural gas? Write down the properties of natural gas.

Dec 2019 Write a note on properties of natural gas.

Dec 2014 What are the properties of natural gas?
Write a short note on raw material for petrochemicals.

Short Answer 4 Marks May-2020 • PTU B-TECH

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Dec 2017
Write in details about primary raw materials for petrochemicals and Crude oil.

What are self assembling materials?

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Dec 2023 Explain the self-assembling materials.

Dec 2017
Describe in details "materials self-assembly".

May 2016 What is self-assembly?

May 2013 Explain self assembling materials and two dimensional assemblies.

Dec 2012 What do you understand by self-assembling materials? Explain.
Discuss mesoscale self assembly.

Short Answer 4 Marks May-2020 • PTU B-TECH

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May 2015 Discuss two dimensional assembly and mesoscale assembly.
Discuss the potential applications of nanomaterial in coming future.

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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.

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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.

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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-2020 (B-TECH 1st-2nd)

Engineering chemistry May-2020

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PART B

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