Seat No.: Enrolment No.
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-I & II (NEW) EXAMINATION - SUMMER-2019
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Subject Code: 2110001 Date: 03/06/2019
Subject Name: Chemistry
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
- Question No.1 is compulsory. Attempt any four out of remaining six questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Objective Question (MCQ) [07]
- In propyne there are
(a) Six sigma bonds and two p bonds--- Content provided by FirstRanker.com ---
(b) Seven sigma bonds and one p bond
(c) Six sigma bonds and one p bond
(d) Eight sigma bonds - Calgon is the name given to
(a) Sodium Silicate--- Content provided by FirstRanker.com ---
(b) Sodium hexameta phosphate
(c) Sodium metaphosphate
(d) Calcium phosphate - The range of UV-visible spectroscopy is
(a) 200-800nm--- Content provided by FirstRanker.com ---
(b) 400-800nm
(c) 200-400nm
(d) None of these - Galvanizing is the process of coating iron with
(a) Mg--- Content provided by FirstRanker.com ---
(b) Cu
(c) Zn
(d) Ni - An example of primary fuel is
(a) Natural gas--- Content provided by FirstRanker.com ---
(b) Petrol
(c) Wood charcoal
(d) Coke - The boiling point of a liquid is the temperature at which vapour pressure
(a) Is equal to internal pressure--- Content provided by FirstRanker.com ---
(b) Is equal to external pressure
(c) Is greater than internal pressure
(d) Is lesser than internal pressure - Corrosion is an example of
(a) Oxidation--- Content provided by FirstRanker.com ---
(b) Reduction
(c) Electrolysis
(d) Erosion
(b) [07]
- 0.1° French= ° Clarke’s.
- Give IUPAC name of Neopentyl chloride
- plastic cannot be remolded.
- Vulcanite contains about 32%
- Vinegar is 6-10% aqueous solution of
- Main component of natural gas is
- Nylon 6:6 is polymer of
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Q.2 (a) Differentiate between ionic bond and covalent bond with suitable examples. [03]
(b) Explain caustic embrittlement in boilers. [04]
(c) Calculate the temporary hardness and permanent hardness (in ppm) of a sample of water containing : Mg(HCO3)2=7.3mg/L; Ca(HCO3)2=16.2mg/L; MgCl2=9.5mg/L; CaSO4=13.6mg/L (Atomic weights of Mg and Ca are 24 and 40 respectively) [07]
Q.3 (a) Define alloy. What are the uses of non-ferrous alloys? [03]
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(b) Write a short note on physical properties of metal. [04]
(c) Discuss mechanism of electrochemical corrosion. [07]
Q.4 (a) Give advantages of R.C.C. over plain concrete. [03]
(b) Why curing of concrete is done? [04]
(c) Define cement. Discuss manufacturing of Portland cement. [07]
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Q.5 (a) Name five fibers made from natural sources. How they differ in their properties. [03]
(b) Discuss properties and uses of insulators. [04]
(c) Draw structure of natural rubber. Discuss the drawback of natural rubber and how it can be overcome. [07]
Q.6 (a) What is “Sacrificial anode”. [03]
(b) Write a short note on refining of petroleum by fractional distillation. [04]
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(c) Discuss benefits and dangers of biotechnology. [07]
Q.7 (a) Define (a) Specific gravity (b) Abrasives (c) Insulators [03]
(b) Explain Seger cone-test and its significance. [04]
(c) How desalination of brackish water is done by electrodialysis cell? [07]
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