Solved question paper for CHEMISTRY May-2015 (B-TECH 1st-2nd)
Solved Question Paper
Engineering chemistry May-2015
PTU • B-TECH • Mechanical Engineering • 1st-2nd • May-2015
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
Solved-
Why is water softened before using in a boiler?Short Answer 2 Marks May-2015 • PTU B-TECH
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Dec 2015 Why is water softened before using in a boiler?
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May 2010 Why is water softened by zeolites unfit for use in boilers?
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May 2005 What are zeolites? Why is water softened by zeolite process unfit for use in boilers?
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Why is rusting of iron in saline water quicker than in ordinary water?Short Answer 2 Marks May-2015 • PTU B-TECH
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Dec 2015 Why is rusting of iron in saline water quicker than in ordinary water?
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Dec 2014 Why is rusting of iron in saline water quicker than in ordinary water?
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Dec 2011 Rusting of iron is quicker in saline water or in ordinary water. Explain.
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What is the basic principle of chromatographic techniques?Short Answer 2 Marks May-2015 • 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 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 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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State the difference between critical point and triple point.Short Answer 2 Marks May-2015 • PTU B-TECH
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Dec 2011 What is the difference between critical point and triple point?
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Dec 2010 What is the difference between critical point and triple point?
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What is fluorescence and how is it different from phosphorescence?Short Answer 2 Marks May-2015 • PTU B-TECH
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May 2022 Differentiate between fluorescence and phosphorescence.
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Dec 2016 Give the difference between fluorescence and phosphorescence.
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Dec 2014 What is the difference between fluorescence and phosphorescence?
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May 2013 What is fluorescence and how it is different from phosphorescence?
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May 2011 Compare fluorescence with phosphorescence.
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Dec 2011 Differentiate fluorescence from phosphorescence.
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Dec 2010 Differentiate phosphorescence from fluorescence.
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May 2005 Distinguish between Fluorescence and phosphorescence.
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State phase rule.Short Answer 2 Marks May-2015 • PTU B-TECH
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Dec 2011 State phase rule.
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Define Retention Factor (Rf).Short Answer 2 Marks May-2015 • PTU B-TECH
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What are primary and secondary photochemical processes?Short Answer 2 Marks May-2015 • PTU B-TECH
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May 2019 What is meant by photochemical processes?
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May 2019 Give examples of photochemical processes.
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May 2018
What is photochemistry?
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May 2013 What is photochemistry?
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May 2012 What are primary and secondary photochemical processes?
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May 2011 What is photochemistry?
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Dec 2011 What is photosensitization?
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Determine the number of components, number of phases and degree of freedom for the equilibrium: N2O4(g) ⇌ 2NO2(g).Short Answer 2 Marks May-2015 • PTU B-TECH
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May 2015 Determine the number of components, number of phases and degree of freedom for the equilibrium: NH4Cl(s) ⇌ NH3(g) + HCl(g), when P(NH3) ≠ P(HCl).
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Dec 2015 Determine the number of components, number of phases and degree of freedom for the equilibrium N2O4(g) ⇌ 2NO2(g).
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Dec 2015 Determine the number of components, number of phases and degree of freedom for the equilibrium NH4Cl(s) ⇌ NH3(g) + HCl(g), when P(NH3) ≠ P(HCl).
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Dec 2014 Determine the number of components, number of phases and degree of freedom on the following equilibria: (i) N2O4(g) ⇌ 2NO2(g) (ii) NH4Cl(s) ⇌ NH3(g) + HCl(g), when P(NH3)=P(HCl).
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Determine the number of components, number of phases and degree of freedom for the equilibrium: NH4Cl(s) ⇌ NH3(g) + HCl(g), when P(NH3) ≠ P(HCl).Short Answer 2 Marks May-2015 • PTU B-TECH
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May 2015 Determine the number of components, number of phases and degree of freedom for the equilibrium: N2O4(g) ⇌ 2NO2(g).
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Dec 2015 Determine the number of components, number of phases and degree of freedom for the equilibrium N2O4(g) ⇌ 2NO2(g).
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Dec 2015 Determine the number of components, number of phases and degree of freedom for the equilibrium NH4Cl(s) ⇌ NH3(g) + HCl(g), when P(NH3) ≠ P(HCl).
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Dec 2014 Determine the number of components, number of phases and degree of freedom on the following equilibria: (i) N2O4(g) ⇌ 2NO2(g) (ii) NH4Cl(s) ⇌ NH3(g) + HCl(g), when P(NH3)=P(HCl).
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What is the range of electromagnetic radiations used in UV-Vis spectrophotometer? Define λmax.Short Answer 2 Marks May-2015 • PTU B-TECH
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May 2013 What is UV and visible range of electromagnetic radiations used in UV-visible spectrophotometer? What is λmax?
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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.Long Answer 4 Marks May-2015 • 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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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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Dec 2007 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.
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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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Discuss hot lime soda process of water softening.Short Answer 4 Marks May-2015 • PTU B-TECH
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May 2014 Discuss the hot lime-soda process for softening of water.
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May 2013 Discuss Lime-soda process for water softening.
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May 2012 Discuss hot lime soda process of water softening.
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May 2012 Discuss hot lime soda process of water softening.
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Dec 2011 Discuss hot lime soda process for softening of water. What are its advantages and disadvantages?
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Explain the mechanism of electrochemical corrosion.Short Answer 4 Marks May-2015 • 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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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 2007 Explain briefly pitting corrosion.
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Dec 2006 Discuss briefly Galvanic corrosion.
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What are inhibitors? Explain types of inhibitors employed to control corrosion.Short Answer 4 Marks May-2015 • PTU B-TECH
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Dec 2015 Explain types of inhibitors employed to control corrosion.
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May 2012 Explain the use of inhibitors for corrosion control.
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May 2011 Discuss the use of corrosion inhibitors.
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Dec 2011 Discuss the use of corrosion inhibitors.
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Discuss various types of liquid chromatography.Short Answer 4 Marks May-2015 • 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.
-
Dec 2016 Name the two phases of chromatography.
-
May 2015 What is the basic principle of chromatographic techniques?
-
Dec 2015 What is the basic principle of chromatographic techniques?
-
May 2014 What is chromatography?
-
May 2014 Define chromatography. Discuss various types of chromatography.
-
May 2014 Give the applications of chromatography.
-
May 2013 What do you understand by partition chromatography?
-
May 2013 What are the types of liquid chromatography?
-
May 2012 What is partition chromatography?
-
May 2012 What is chromatography? Discuss its classification.
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Dec 2012 What is chromatography?
-
Dec 2012 Discuss classification of chromatography.
-
May 2011 What are the advantages of chromatography?
-
May 2011 What is chromatography? Discuss the types of chromatography.
-
Dec 2011 Give the classification of chromatography.
-
May 2010 Explain partition chromatography.
-
May 2010 Explain paper chromatography.
-
May 2010 Explain thin layer chromatography.
-
Dec 2010 How chromatographic separation methods can be classified?
-
Dec 2010 Briefly discuss the applications of chromatography.
-
May 2007 What are various classes of chromatography? Bring out clearly the principles involved in each case.
-
Dec 2007 What are various classes of chromatography? Bring out clearly the principles involved in each case.
-
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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Discuss briefly the flow diagram of LC instrument with diagram.Short Answer 4 Marks May-2015 • PTU B-TECH
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Dec 2016 Give flow diagram of LC instrument.
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Dec 2012 Draw well labelled flow diagram of LC instrument. Discuss briefly.
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Dec 2011 Draw flow diagram of LC instrument.
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Derive Nernst equation and give its significance.Long Answer 5 Marks May-2015 • PTU B-TECH
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May 2020 Derive Nernst equation.
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Dec 2019 Write down the Nernst equation and define electric potential.
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Dec 2015 Derive Nernst equation and give its significance.
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Dec 2012 Discuss Nernst\'s equation for electrode potential and emf of cell.
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May 2011 Describe emf of electrochemical cell by taking suitable example.
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May 2007 What is Nernst equation? Write its applications.
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Dec 2006 What is Nernst equation? Write its applications.
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Dec 2005 Derive Nernst equation and give its significance.
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Calculate the EMF of the given cell at 298 K: Ag(s)|AgNO3 (0.018 m) || AgNO3 (1.2 m) | Ag(s).Short Answer 3 Marks May-2015 • PTU B-TECH
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Dec 2015 Calculate the EMF of the given cell at 298 K: Ag(s)|AgNO3 (0.018 m)|| AgNO3 (1.2 m)|Ag(s).
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How do photochemical reactions differ from thermal reactions? Discuss Stark-Einstein law of photochemical equivalence.Long Answer 5 Marks May-2015 • PTU B-TECH
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May 2011 Give difference between photochemical and thermal reactions.
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Dec 2011 How photochemical reactions differ from thermal reactions? Discuss Stark-Einstein law of photochemical equivalence.
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Define quantum yield. Discuss reasons for low and high quantum yield.Short Answer 3 Marks May-2015 • PTU B-TECH
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Dec 2015 Discuss reasons for low quantum yield and high quantum yield.
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“IR spectra is often characterized as molecular finger prints.” Justify this statement.Short Answer 3 Marks May-2015 • PTU B-TECH
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Dec 2015 “IR spectra is often characterized as molecular finger prints.” Justify this statement.
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Dec 2014 “IR spectra is often characterized as molecular finger prints.” Justify this statement.
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Dec 2011 IR spectra is often characterized as molecular finger prints. Explain.
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Calculate the number of vibrational degrees of freedom in the following compounds: (i) CO2 (ii) SO2 (iii) CH4.Short Answer 3 Marks May-2015 • PTU B-TECH
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Dec 2015 Calculate the number of vibrational degrees of freedom in CO2.
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Dec 2015 Calculate the number of vibrational degrees of freedom in CH4.
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Dec 2014 Calculate the number of vibrational degrees of freedom in CO2.
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Dec 2014 Calculate the number of vibrational degrees of freedom in CH4.
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Which of the following molecules will show IR spectra and why: H2, HCl, CH4, CO2, H2OShort Answer 2 Marks May-2015 • PTU B-TECH
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May 2015 Which of the following will exhibit infrared spectra and why? N2, HCl, O2, CO2.
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Dec 2015 Which of the following molecules will show IR spectra and why: H2, HCl, CH4, CO2, H2O?
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Dec 2014 Which of the following molecules will show IR spectra and why: H2, HCl, CH4, CO2, H2O
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Discuss the principles of NMR.Short Answer 4 Marks May-2015 • PTU B-TECH
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May 2016 Explain the principle of nuclear magnetic resonance spectroscopy.
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Dec 2016 Discuss the principle of NMR spectroscopy.
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Dec 2016 What is NMR and MRS?
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Dec 2015 What is chemical shift in NMR?
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May 2014 Explain the principle of NMR spectroscopy.
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Dec 2014 Explain principles of NMR Spectroscopy.
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Dec 2012 Explain spin-spin splitting in NMR.
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Dec 2012 Explain the principle of NMR.
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Dec 2011 What information is obtained from spin-spin splitting in NMR?
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Dec 2008 Explain the shielding and deshielding process in NMR-spectroscopy with some suitable examples.
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May 2005 In relation to NMR spectra, explain Chemical Shift and TMS.
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May 2005 In relation to NMR spectra, explain Shielding and Deshielding.
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Dec 2005 What do you understand by NMR spectroscopy?
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Explain the 1H NMR patterns and intensities of isopropyl group in isopropyl alcohol.Short Answer 4 Marks May-2015 • PTU B-TECH
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May 2014 Explain the ¹H NMR patterns and intensities of the isopropyl group in isopropyl iodide.
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State and explain phase rule, describe phase diagram of phenol-water system and triethylamine-water system.Long Answer 8 Marks May-2015 • PTU B-TECH
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Dec 2015 Describe phase diagram of phenol-water system.
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Answers about this subject, solved papers, and preparation.
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.