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

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Solved Question Paper

Chemistry May-2023

PTU • B-TECH • Mechanical Engineering • 1st-2nd • May-2023

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 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 chemistry syllabus 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.

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SECTION - B & C have FOUR questions each, carrying EIGHT mark s each.

Short Answer May-2023 • PTU B-TECH

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May 2025 SECTION -B &C. have FOUR questions each.

Dec 2024 SECTION -B&C have FOUR questions each.

Dec 2024 SECTION-Bac have FOUR questions each, ;

Dec 2023 SECTION -B & C. have FOUR questions each.

Dec 2023 SECTION -B & C have FOUR questions each.

Dec 2020 SECTION -B &C. have FOUR questions each.
Write briefly: a)

Short Answer May-2023 • PTU B-TECH

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What is the difference between oxidation number and oxidation state?

Short Answer May-2023 • PTU B-TECH

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May 2025 What is the difference betwéen oxidation number and oxidation state?

May 2023 What is the difference between oxidation number and oxidation state? (2)
What do you understand by substitution/elimination ratio?

Short Answer May-2023 • PTU B-TECH

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Which of the following will show IR spectrum? Oଶ, Nଶ, HI, COଶ

Short Answer May-2023 • PTU B-TECH

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What is standard reduction potential?

Short Answer May-2023 • PTU B-TECH

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What information can be drawn from Ellingham diagrams?

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Dec 2024 What is Ellingham diagram? How can it be constructed? Discuss its important characteristics.

Dec 2024 What is Ellingham diagram? How can it be constructed? Discuss its important characteristics.

Dec 2023 b) What is Ellingham Diagram? How it can be constructed? What are the important characteristics?
Why d and f orbitals show poor shielding effect?

Short Answer May-2023 • PTU B-TECH

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Dec 2023 Why d and forbital Show poor shielding effect?

List the factors on which Δ଴

Short Answer May-2023 • PTU B-TECH

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The following compounds show only one signal in

Short Answer May-2023 • PTU B-TECH

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Deduce the time-independent Schrodinger equation. (6)

Short Answer May-2023 • PTU B-TECH

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Give the significance of wave function. (2)

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Dec 2020 Give the physical meaning of wave function. (2)

Under the influence of crystal field, predict the electronic arrangem ent on the metal ions and nature of ligands in the following complexes:

Short Answer May-2023 • PTU B-TECH

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[Fe(HଶO)଺]ଶା ii) [Fe(CN)଺]ସି iii) [Fe(CN)଺]ଷି How many unpaired electrons are there in each complex and what would be their magnetic moments? (6)

Short Answer May-2023 • PTU B-TECH

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What is meant by band theory? What is the difference between conduct ion band and valence band? (2)

Short Answer May-2023 • PTU B-TECH

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Explain the theory of NMR spectroscopy. (6)

Short Answer May-2023 • PTU B-TECH

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May 2025 In 1H NMR spectroscopy, what is meant by chemical shift?

May 2025 b) What is the principle of NMR spectroscopy? Explain.

Dec 2023 b) Explain chemical shift in NMR.

Dec 2023 Describe the working principle and selection rule for NMR.

What is the difference between diffraction and scattering? (2)

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May 2025 Differentiate between scattering and diffraction.

Dec 2023 c) Differentiate between Scattering and Diffraction.
Define excluded volume. Show that excluded volume, designated as b, is four times the actual volume of gas molecules. (5)

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Calculate the pressure exerted by one mole of COଶ gas in 1.36 dmଷvessel at 48∘Cusing van der Waals equation. Given: ? = 3.59dm଺atmmolିଶ and ? = 0.0427dmଷmolିଵ. (3)

Short Answer May-2023 • PTU B-TECH

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What is corrosion? Discuss mechanism of dry corrosion. (5)

Short Answer May-2023 • PTU B-TECH

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May 2025 What is Dry corrosion? Explain.

May 2025 What is corrosion? Discuss mechanism of dry corrosion.

Calculate the standard free energy change (Δ?∘) of the reaction: 1/2Hଶ(g) + 1/2Iଶ(s) → HI(g) ΔH∘ = 25.95kJ The standard entropy of HI(g), Hଶ(g) and Iଶ(s) are 206.27, 130.60 and 116.73JKିଵmolିଵ, respectively. Is this reaction feasible at standard state? (3)

Short Answer May-2023 • PTU B-TECH

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Discuss the molecular geometries of the following:

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Dec 2020 Discuss the molecular geometries of the following :
NH 3

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SF 6 (Atomic number: N = 7, S = 16 ) (4)

Short Answer May-2023 • PTU B-TECH

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What is the difference between oxidation number and oxidation state? (2)

Short Answer May-2023 • PTU B-TECH

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May 2025 What is the difference betwéen oxidation number and oxidation state?

May 2023 What is the difference between oxidation number and oxidation state?
What is electron affinity? Which element has highest electron affi nity? (2)

Short Answer May-2023 • PTU B-TECH

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Discuss the following: (4)

Short Answer May-2023 • PTU B-TECH

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Enantiomers ii) Diastereomers

Short Answer May-2023 • PTU B-TECH

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Discuss isomerism in transitional metal complexes. (4)

Short Answer May-2023 • PTU B-TECH

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Compare and contrast the S N1 and SN2 mechanisms of substitution of alkylhalides. (4)

Short Answer May-2023 • PTU B-TECH

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Write short notes on the following organic reactions: (4)

Short Answer May-2023 • PTU B-TECH

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Dec 2023 b) Write short notes on the following organic reactions :\\r\\ni) Oxidation Reactions

Dec 2023 a) Write short notes on the following organic reactions: i) Oxidation reactions

Dec 2020 Write short notes on the following organic reactions : ”
Cyclization reactions

Short Answer May-2023 • PTU B-TECH

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Reduction reactions NOTE : Disclosure of Identity by writing Mobile No. or Marking of passing request on any paper of Answer Sheet will lead to UMC against the Student.

Short Answer May-2023 • PTU B-TECH

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Dec 2023 Free energy. NOTE : Disclosure of Identity by writing Mobile No. or Marking of passing request on any paper of Answer Sheet will lead to UMC against the Student. 3 |

Dec 2020 Ring opening reactions (2) NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student. 3 | M-75343 (S1)-734

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

This page lists 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 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 Chemistry usually cover?

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

05 Does this page include a Chemistry syllabus 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 Chem May-2023 (B-TECH 1st-2nd)

Chemistry May-2023

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