Solved question paper for CHEMISTRY Dec-2007 (B-TECH 1st-2nd)
Solved Question Paper
Engineering chemistry Dec-2007
PTU • B-TECH • Mechanical Engineering • 1st-2nd • Dec-2007
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
Solved Questions
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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?Short Answer Dec-2007 • PTU B-TECH
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May 2020 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?
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What is Calgon conditioning of boiler feed water?Short Answer Dec-2007 • PTU B-TECH
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May 2022 What is calgon conditioning of boiler feed water?
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Dec 2016 What is boiler feed water and boiler corrosion?
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May 2014 What are the specifications for boiler feed water?
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May 2007 What is colloidal conditioning of boiler feed water?
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Dec 2006 What is colloidal conditioning of boiler feed water?
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What is the importance of IR spectroscopy in the fingerprint region?Short Answer Dec-2007 • PTU B-TECH
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May 2022 What is the importance of ‘finger print region’ in infrared spectroscopy?
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May 2020 What is the importance of finger print region in IR spectroscopy?
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May 2007 What is the importance of IR spectroscopy in fingerprint region?
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Dec 2006 What is the importance of IR spectroscopy in finger print region?
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Why is TMS used as an internal standard in NMR spectroscopy?Short Answer Dec-2007 • PTU B-TECH
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May 2020 Why is TMS used as an internal standard in NMR spectroscopy?
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May 2014 What is the purpose of using TMS in recording ^1H NMR spectrum?
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May 2010 Why is TMS used as an internal standard for NMR?
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What is chemiluminescence? Give examples.Short Answer Dec-2007 • PTU B-TECH
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What are eutectics? Give an example.Short Answer Dec-2007 • PTU B-TECH
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The standard EMF of the Daniell cell involving the cell reaction Zn(s) + Cu2+(aq) ↔ Zn2+(aq) + Cu(s) is 1.10 volts. Calculate the equilibrium constant of the cell reaction at 25°C.Short Answer Dec-2007 • PTU B-TECH
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What is Rf value in chromatography?Short Answer Dec-2007 • PTU B-TECH
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May 2010 What is R value in chromatography?
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May 2007 What is Rf value in chromatography?
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Dec 2006 What is Rf value in chromatography?
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Why does hard water consume a lot of soap?Short Answer Dec-2007 • PTU B-TECH
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Why are electronic absorption bands generally broader as compared to infrared absorption bands?Short Answer Dec-2007 • PTU B-TECH
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Describe the ion exchange process of softening hard water. What are its advantages?Long Answer Dec-2007 • PTU B-TECH
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May 2016 Discuss in details different methods for softening of water.
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Dec 2016 Discuss the cation and anion exchange resins, and their usefulness for water softening.
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Dec 2016 Explain any two methods of water softening.
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May 2014 Describe Zeolite method for softening of water.
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Dec 2012 Describe ion exchange method for softening of water.
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May 2011 Describe Zeolite method for softening of water.
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Dec 2010 Discuss ion exchange method for water softening.
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Calculate the amount of lime (91% pure) and soda (97.2% pure) required for softening one million litres of water containing H+ (free acidity) = 1.5 ppm; HCO3- = 396.5 ppm; Mg2+ = 42 ppm; Ca2+ = 90 ppm; FeSO4.7H2O = 14 ppm.Long Answer Dec-2007 • PTU B-TECH
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Dec 2018 Calculate the amount of soda and lime required for softening 25000 L of water. The quality control lab has reported following salts and their quantities: Ca(HCO3)2 = 15 mg, Mg(HCO3)2 = 10 mg, MgSO4 = 18 mg, CaSO4 = 20 mg, CaCl2 = 8 mg and NaCl = 4 mg. (Atomic Weight of Ca = 40, Mg = 24, Cl = 35.5, Na = 23, S = 32, O = 16, H = 1)
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May 2015 Calculate the amount of lime and soda required to soften 50,000 litres of water having following analysis: Ca(HCO3)2 = 8.1 mg; Mg(HCO3)2 = 5.0 mg; CaSO4 = 13.6 mg; MgCl2 = 2.0 mg; MgSO4 = 12.0 mg; NaCl = 4.7 mg.
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May 2015 Calculate the quantity of lime and soda needed for softening 60,000 liters of water containing the following salts per liter: Ca(HCO3)2 = 8.6 mg, Mg(HCO3)2 = 7.0 mg, CaSO4 = 13.6 mg, MgSO4 = 12.3 mg, MgCl2 = 2.0 mg and NaCl = 4.9 mg.
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Dec 2014 Calculate the amount of lime and soda required for softening 90,000 liters of water containing the following salts per liter: Ca(HCO3)2 = 162 mg, CaSO4 = 136 mg and NaCl = 56.1 mg. Purity of lime is 92% and soda is 99%.
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May 2011 A water sample on analysis gave the following: Ca2+ = 30 mg/L, Mg2+ = 24 mg/L, CO3 = 32 mg/L, HCl = 50 mg/L, K = 10 mg/L. Calculate the quantities of lime (purity 90%) and soda (purity 94%) required to soften one million litres of water.
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May 2011 A water sample contains 40 ppm of Ca2+, 36 ppm of Mg2+, 48 ppm of SO4^2- and 366 ppm of HCO3-. Calculate the amount of lime and soda needed for softening.
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Dec 2011 Calculate the quantity of lime and soda needed for softening 50,000 litres of water containing the following salts per litre: Ca(HCO3)2 = 8.1 mg; Mg(HCO3)2 = 7.5 mg; CaSO4 = 13.6 mg; MgSO4 = 12.0 mg; MgCl2 = 2.0 mg and NaCl = 4.7 mg.
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May 2005 A sample of water was analyzed and found to contain temporary magnesium hardness 25 mg/lit. Permanent magnesium chloride hardness is 15 mg/lit and permanent calcium sulphates hardness 20 mg/lit. SiO2 = 300 mg/lit. Calculate the lime and soda required for softening 30,000 liters of hard water.
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Describe various methods employed for protection of metals from corrosion.Long Answer Dec-2007 • PTU B-TECH
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May 2023 a) Discuss the importance of design and material selection in controlling corrosion.
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Dec 2019 Discuss briefly about differential aeration corrosion.
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May 2013 Explain the protective measures of controlling corrosion.
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May 2013 Discuss atmospheric corrosion.
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May 2012 Discuss metal alloys for corrosion control.
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May 2012 Discuss anodic and cathodic coating for corrosion control.
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Dec 2012 Discuss differential aeration corrosion.
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May 2007 Discuss the importance of design and material selection in controlling corrosion.
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May 2007 Discuss briefly: Stress corrosion
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Dec 2006 Discuss the importance of design and material selection in controlling corrosion.
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Dec 2006 Discuss briefly Stress corrosion.
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Explain briefly galvanic cell corrosion.Short Answer Dec-2007 • PTU B-TECH
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May 2020 Explain the mechanism of galvanic corrosion.
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May 2020 Explain the mechanism of wet corrosion.
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May 2019 Discuss the chemistry and mechanism of wet corrosion.
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Dec 2018 Discuss the mechanism of wet corrosion.
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Dec 2017
Explain the mechanism of electrochemical corrosion with example.
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May 2016 What is corrosion? Explain electrochemical theory of corrosion.
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May 2016 Explain differential metal corrosion.
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Dec 2016 Explain differential aeration corrosion.
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Dec 2016 Give the cause of corrosion.
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May 2015 Explain waterline corrosion.
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May 2015 Explain stress corrosion.
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May 2015 Explain the mechanism of electrochemical corrosion.
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Dec 2015 Describe sacrificial anodic method for corrosion prevention with an example.
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May 2014 Define corrosion. Discuss the mechanism of wet corrosion.
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May 2012 Explain the mechanism of wet corrosion.
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Dec 2012 Describe the mechanism of electrochemical corrosion.
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Dec 2012 Explain dry corrosion.
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Dec 2012 Describe the mechanism of electrochemical corrosion.
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May 2011 Discuss the mechanism of wet corrosion.
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Dec 2011 Discuss mechanism of wet corrosion.
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May 2008 What is corrosion of metals? Explain electro-chemical corrosion with its mechanism.
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Dec 2008 Explain the type of corrosion with evolution of hydrogen ions.
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May 2007 Discuss briefly: Galvanic corrosion
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Dec 2007 Explain briefly pitting corrosion.
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Dec 2006 Discuss briefly Galvanic corrosion.
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Explain briefly pitting corrosion.Short Answer Dec-2007 • PTU B-TECH
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May 2020 Explain the mechanism of galvanic corrosion.
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May 2020 Explain the mechanism of wet corrosion.
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May 2019 Discuss the chemistry and mechanism of wet corrosion.
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Dec 2018 Discuss the mechanism of wet corrosion.
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Dec 2017
Explain the mechanism of electrochemical corrosion with example.
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May 2016 What is corrosion? Explain electrochemical theory of corrosion.
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May 2016 Explain differential metal corrosion.
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Dec 2016 Explain differential aeration corrosion.
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Dec 2016 Give the cause of corrosion.
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May 2015 Explain waterline corrosion.
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May 2015 Explain stress corrosion.
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May 2015 Explain the mechanism of electrochemical corrosion.
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Dec 2015 Describe sacrificial anodic method for corrosion prevention with an example.
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May 2014 Define corrosion. Discuss the mechanism of wet corrosion.
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May 2012 Explain the mechanism of wet corrosion.
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Dec 2012 Describe the mechanism of electrochemical corrosion.
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Dec 2012 Explain dry corrosion.
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Dec 2012 Describe the mechanism of electrochemical corrosion.
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May 2011 Discuss the mechanism of wet corrosion.
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Dec 2011 Discuss mechanism of wet corrosion.
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May 2008 What is corrosion of metals? Explain electro-chemical corrosion with its mechanism.
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Dec 2008 Explain the type of corrosion with evolution of hydrogen ions.
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May 2007 Discuss briefly: Galvanic corrosion
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Dec 2007 Explain briefly galvanic cell corrosion.
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Dec 2006 Discuss briefly Galvanic corrosion.
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What are various classes of chromatography? Bring out clearly the principles involved in each case.Long Answer Dec-2007 • PTU B-TECH
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May 2017
What is partition chromatography?
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May 2016 What is the basic principle of Chromatography? Give various types of liquid chromatography.
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Dec 2016 Name the two phases of chromatography.
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May 2015 What is the basic principle of chromatographic techniques?
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May 2015 Discuss various types of liquid chromatography.
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Dec 2015 What is the basic principle of chromatographic techniques?
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May 2014 What is chromatography?
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May 2014 Define chromatography. Discuss various types of chromatography.
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May 2014 Give the applications of chromatography.
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May 2013 What do you understand by partition chromatography?
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May 2013 What are the types of liquid chromatography?
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May 2012 What is partition chromatography?
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May 2012 What is chromatography? Discuss its classification.
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Dec 2012 What is chromatography?
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Dec 2012 Discuss classification of chromatography.
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May 2011 What are the advantages of chromatography?
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May 2011 What is chromatography? Discuss the types of chromatography.
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Dec 2011 Give the classification of chromatography.
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May 2010 Explain partition chromatography.
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May 2010 Explain paper chromatography.
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May 2010 Explain thin layer chromatography.
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Dec 2010 How chromatographic separation methods can be classified?
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Dec 2010 Briefly discuss the applications of chromatography.
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May 2007 What are various classes of chromatography? Bring out clearly the principles involved in each case.
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Dec 2006 What are various classes of chromatography? Bring out clearly the principles involved in each case.
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May 2005 How are chromatographic techniques classified? Discuss in brief chromatographic mechanism.
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May 2005 Explain the chromatographic development with suitable example.
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Write short note on liquid chromatography.Short Answer Dec-2007 • PTU B-TECH
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May 2018
Write a detailed note on chromatographic development and applications of chromatography.
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Dec 2015 Write short notes on gas chromatography.
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Dec 2015 Write short notes on HPLC.
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May 2007 Write short notes on liquid chromatography.
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May 2007 Write short notes on vapour phase chromatography.
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Dec 2007 Write short note on vapor phase chromatography.
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Dec 2006 Write short notes on Liquid chromatography.
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Dec 2006 Write short notes on Vapour phase chromatography.
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Dec 2005 Write short notes on Liquid Chromatography.
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Dec 2005 Write short notes on Classification of chromatography Methods.
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Write short note on vapor phase chromatography.Short Answer Dec-2007 • PTU B-TECH
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May 2018
Write a detailed note on chromatographic development and applications of chromatography.
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Dec 2015 Write short notes on gas chromatography.
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Dec 2015 Write short notes on HPLC.
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May 2007 Write short notes on liquid chromatography.
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May 2007 Write short notes on vapour phase chromatography.
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Dec 2007 Write short note on liquid chromatography.
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Dec 2006 Write short notes on Liquid chromatography.
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Dec 2006 Write short notes on Vapour phase chromatography.
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Dec 2005 Write short notes on Liquid Chromatography.
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Dec 2005 Write short notes on Classification of chromatography Methods.
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What are secondary cells? Describe the construction of one secondary cell. Write the cell reactions and mention its uses.Long Answer Dec-2007 • PTU B-TECH
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A cell consists of two hydrogen electrodes. The negative electrode is in contact with a solution of 10^-6 M hydrogen ions. The EMF of the cell is 0.118 V at 25°C. Calculate the concentration of hydrogen ion at the positive electrode.Short Answer Dec-2007 • PTU B-TECH
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May 2010 A cell consists of two hydrogen electrodes. The negative electrode is in contact with a solution of 10^-4 M hydrogen ions. The EMF of the cell is 0.118 V at 25°C. Calculate the concentration of hydrogen ion at positive electrode.
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Explain photosensitization and quenching by taking suitable examples.Short Answer Dec-2007 • PTU B-TECH
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What are lasers? Explain laser action with reference to a three energy level laser and a four energy level laser. Discuss briefly the practical uses of lasers.Long Answer Dec-2007 • PTU B-TECH
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State and illustrate with suitable potential energy curves the Franck-Condon principle in the vibronic spectrum of a diatomic molecule.Long Answer Dec-2007 • PTU B-TECH
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A substance when dissolved in water at 10^-3 M concentration absorbs 10 percent of an incident radiation in a path of 1 cm length. What should be the concentration of the solution in order to absorb 90 percent of the same radiation?Short Answer Dec-2007 • PTU B-TECH
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May 2016 A substance when dissolved in water at 10–3 M concentration absorbs 10% of the incident radiation in a path of 1 cm length. What should be the concentration of the solution in order to absorb 80% of the same radiation?
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Define wave number. What are its units?Short Answer Dec-2007 • PTU B-TECH
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What are the advantages of taking NMR spectrum at more than one radiofrequency?Short Answer Dec-2007 • PTU B-TECH
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Write brief note on chemical shift.Short Answer Dec-2007 • PTU B-TECH
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May 2010 Write short notes on chemical shift.
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May 2007 Write brief notes on chemical shift.
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Dec 2006 Write brief notes on Chemical Shift.
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Write brief note on spin-spin coupling.Short Answer Dec-2007 • PTU B-TECH
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Dec 2023 Explain the Spin-Spin coupling.
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May 2013 What information can be obtained from spin-spin coupling?
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Dec 2010 What do you understand by spin-spin coupling?
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May 2007 Write brief notes on spin-spin coupling.
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Dec 2006 Write brief notes on Spin-spin coupling.
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How will you verify that a particular signal in NMR spectrum arises from –OH, –NH or –SH groups?Short Answer Dec-2007 • PTU B-TECH
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May 2007 How will you verify that a particular signal in NMR spectrum arises from –OH, -NH or -SH groups?
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Dec 2006 How will you verify that a particular signal in NMR spectrum arises from –OH, -NH or –SH groups?
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Draw and discuss the phase diagram for carbon dioxide system. In what respect does this system differ from the water system?Long Answer Dec-2007 • PTU B-TECH
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Dec 2016 Explain phase diagram of one component system- water and carbon dioxide.
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Dec 2011 Draw and discuss phase diagram of carbon dioxide.
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May 2008 Draw a phase diagram of CO2 system. In what respect does the system differ from water system?
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Liquid A and B form an ideal solution obeying Raoult’s law. At 50°C the total pressure of a solution containing 1 mole of A and 2 moles of B is 300 torr. When 1 mole of A is added to the solution, the total vapor pressure increases to 400 torr. Calculate the vapor pressure of the pure components.Long Answer Dec-2007 • PTU B-TECH
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01 Where can I find engineering chemistry previous year question papers for Bachelor of Technology, 1st-2nd semester?
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02 Are these official Punjab Technical University question papers?
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03 How can previous year engineering chemistry papers help in exam preparation?
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04 What kind of topics does engineering chemistry usually cover?
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