Solved question paper for Chem Dec-2020 (B-TECH 1st-2nd)
Solved Question Paper
Chemistry Dec-2020
PTU • B-TECH • Information Technology • 1st-2nd • Dec-2020
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.
These Questions are downloaded from www.brpaper.com. You can also download previous years question papers of 10th and 12th (PSEB & CBSE), B-Tech, Diploma, BBA, BCA, MBA, MCA, M-Tech, PGDCA, B-Com, BSc-IT, MSC-IT.
Solved Questions
Solved-
How many signals would you expect to see in the 1 H NMR spectrum of the following : 2. How are salts responsible for the temporary and permanent hardness of water? Explain. 3. State Beer - Lambert Law. 4. What are concentration cells ? 5. State the law of photochemical equivalence. 6. Define Atom Economy. 7. Why does Mg(HC O3)2 require double amount of lime for softening? 8. Define Molecular self Assembly. 9. What is the importance of finger print region in IR spectroscopy? OCH 3 OCH 3 CH CH CH CH 3 2 2 3 2|M- - 471 10. “ 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? -B 11. a) Explain any two principle ’s of Green Chemistry with the help of examples. (5) b) Elaborate the statement - “ Microwave heating as a Greener Technology ” . (3)Short Answer Dec-2020 • PTU B-TECH
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Calculate the amount of lime (84% pure) and Soda (92% pure) req uired for treatment of 20,000 liters of water, whose an alysis is as follows Ca(HC O3)2 = 40.5 ppm; Mg(HC O3)2 = 36.5 ppm: MgS O4 = 30.00 ppm: CaS O4 = 34.0 ppm: CaC l2 = 27.75 ppm and NaC l = 10.00 ppm. Also calculate the temporary and permanent hardness of water. (4) b) What are lime and soda processes? Compare hot and cold soda lime process for softening of hard water. (4)Short Answer Dec-2020 • PTU B-TECH
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How do you distinguish between different types of transitions involved in UV - Vis spectroscopy? (4) b) How many NMR signals are observed in the spectrum of : (4) i) CH 3 COOCH 3 ii) CH3- CH 2- CH 2 CH 3 CH 3 OCH 3 iv) CH 3 CH 2 CH 314. a) Draw a well labelled Jablonski diagram and explain : i) Intersystem crossing (2) ii) Phosphorescence (2) Fluorescence (2) b) 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 dm 3 mol -1 cm -1. (2) 3|M- - 471-C15 . a) Explain the mechanism of following types of corrosion : i) Galvanic (2) ii) Wet (2) b) What are the various methods that needs to be followed to control corrosion? (4)Short Answer Dec-2020 • PTU B-TECH
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What are different type of polymerization reac t ions? Give examples . (4) b) How does molecular weight affect the properties of polymer? (4)Short Answer Dec-2020 • PTU B-TECH
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Write a short note on any two of the following : (4 × 2=8) a) Classification of crude oil b) Properties of natural gas c) Raw material for petrochemicalsShort Answer Dec-2020 • PTU B-TECH
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What are self assembling materials? Also discuss mesoscale self assembly. (4) b) Discuss the potential applications of nanomaterial in coming future. (4) N OTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any pa ge of Answer Sheet will lead to UMC against the StudentShort Answer Dec-2020 • PTU B-TECH
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FAQ
Frequently Asked Questions
Answers about this subject, solved papers, and preparation.
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.