Solved question paper for Chem May-2025 (B-TECH 1st-2nd)

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Chemistry May-2025

PTU • B-TECH • Mechanical Engineering • 1st-2nd • May-2025

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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Define aromaticity and give one example of an aromatic molecule.

Very Short Answer 2 Marks May-2025 • PTU B-TECH

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Dec 2024 What are the criteria for the molecule to be aromatic?

Dec 2024 What are the criteria for the molecule to be aromatic?
Draw the pi-molecular orbital's of buta-diene.

Very Short Answer 2 Marks May-2025 • PTU B-TECH

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What is spin-spin coupling in NMR?

Very Short Answer 2 Marks May-2025 • PTU B-TECH

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

Very Short Answer 2 Marks May-2025 • PTU B-TECH

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

May 2023 Explain the theory of NMR spectroscopy. (6)

Dec 2023 b) Explain chemical shift in NMR.

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

What are Van der Waals interactions, and how do they differ from ionic and dipolar interactions?

Very Short Answer 2 Marks May-2025 • PTU B-TECH

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May 2025 What are dipole-dipole interactions? Explain.

Dec 2024 What are ionic interactions, and how do they differ from dipolar interactions?
List any three factors that affect the rate of corrosion.

Very Short Answer 2 Marks May-2025 • PTU B-TECH

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How do atomic and ionic sizes change across a period and down a group in the periodic table?

Very Short Answer 2 Marks May-2025 • PTU B-TECH

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Why do noble gases have positive electron gain enthalpies?

Very Short Answer 2 Marks May-2025 • PTU B-TECH

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What is the difference between enantiomers and diastereomers?

Very Short Answer 2 Marks May-2025 • PTU B-TECH

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May 2025 What is enantiomerism? Explain the requirement for enantiomerism.

Dec 2024 b) What is chirality and explain why certain molecules are chiral?

Dec 2024 What is optical activity and how can it be used to distinguish between enantiomers?

Dec 2024 What are the differences between diastereoisomer and enantiomer?

Dec 2024 What are the differences between diastereoisomer and enantiomer?

Dec 2024 What is optical activity and how it can be used to distinguish between enantiomers?

Dec 2024 What is chirality and explain why certain molecules are Chiral?

Dec 2023 a)“ Define chirality. What are chiral molecules?

Dec 2023 Whatis diastereomerism? Explain by giving at Icast two examples.
What is the difference between electrophilic and nucleophilic, substitution reactions?

Very Short Answer 2 Marks May-2025 • PTU B-TECH

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May 2025 What is an electrophilic addition reaction, and how does it differ from nucleophilic addition? Explain by giving suitable examples.
a) What is the effect of doping on-the band structure of semiconductors and how does it influence their electrical conductivity?

Long Answer 8 Marks May-2025 • PTU B-TECH

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Dec 2024 Explain how n-type and p-type doping modify the band structure of a semiconductor and affect its conductivity?
b) Explain how d-orbitals split in a tetrahedral crystal field. Why crystal field splitting in tetrahedral environment is lower than the octahedral environment?

Long Answer 8 Marks May-2025 • PTU B-TECH

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Dec 2024 a) How can you explain the splitting of d-orbitals in an octahedral crystal field?

Dec 2024 How can you explain the Splitting of d-orbitals in an octahedral crysta] field?

a) Derive the Schrodinger wave equation and explain the physical significance of \(\Psi\) and \(\Psi^2\).

Long Answer 8 Marks May-2025 • PTU B-TECH

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b) What is the principle behind electronic spectroscopy, and what types of electronic transitions can occur in molecules?

Long Answer 8 Marks May-2025 • PTU B-TECH

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Dec 2024 What is the principle of electronic spectroscopy?

Dec 2024 What is the principle of electronic spectroscopy?
b) What is the principle of NMR spectroscopy? Explain.

Long Answer 8 Marks May-2025 • PTU B-TECH

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

May 2023 Explain the theory of NMR spectroscopy. (6)

Dec 2023 b) Explain chemical shift in NMR.

Dec 2023 Describe the working principle and selection rule for NMR.
a) Define the critical point of a substance and explain the relationship between critical constants and the van der Waals constants.

Long Answer 8 Marks May-2025 • PTU B-TECH

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Dec 2023 b) What do you mean by critical phenomenon in gases? How are critical constants related to van der Waals constants?

b) How does the behavior of real gases deviate from ideal gas behavior at high pressure or low temperature?

Long Answer 8 Marks May-2025 • PTU B-TECH

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May 2025 Explain the deviation of real gases from ideal behavior.

Dec 2023 a) How and why do real gases deviate from ideality?
a) What are the various problems associated with hard water and how it affects daily life?

Long Answer 8 Marks May-2025 • PTU B-TECH

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b) State the Nernst equation and explain its application in calculating cell potentials.

Long Answer 8 Marks May-2025 • PTU B-TECH

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Dec 2023 a) Derive Nernst Equation for the calculation of cell E.M.F.

Dec 2023 a) Derive Nernst equation for calculation of cell e.m.f.

Dec 2023 Derive Nernst Equation and give its application.
a) What is the effective nuclear charge, and how does it affect the behavior of electrons in an atom?

Long Answer 8 Marks May-2025 • PTU B-TECH

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b) How does electro negativity influence the polarity of chemical bonds?

Long Answer 8 Marks May-2025 • PTU B-TECH

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a) Give the conformational analysis of Propane by drawing the potential energy diagram for various conformations of it.

Long Answer 8 Marks May-2025 • PTU B-TECH

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Dec 2024 a) Perform a conformational analysis of Ethane and illustrate the potential energy diagram for its various conformations.

Dec 2024 Perform a conformational] analysis of Ethane and illustrate the potential energy diagram for its various conformations.
b) i. Chirality

Long Answer May-2025 • PTU B-TECH

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Dec 2020 Chirality (2)
b) ii. Optical activity

Long Answer 8 Marks May-2025 • PTU B-TECH

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Dec 2020 Optical activity (2)

What is an electrophilic addition reaction, and how does it differ from nucleophilic addition? Explain by giving suitable examples.

Long Answer 8 Marks May-2025 • PTU B-TECH

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May 2025 What is the difference between electrophilic and nucleophilic, substitution reactions?
a) What factors influence the value of \(\lambda_{max}\) and the intensity of spectral lines?

Long Answer 8 Marks May-2025 • PTU B-TECH

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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-2025 (B-TECH 1st-2nd)

Chemistry May-2025

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