Download GTU BE/B.Tech 2019 Summer 1st Sem And 2nd Sem Old 110001 Chemistry Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER-I & II (OLD) EXAMINATION — SUMMER-2019

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Subject Code: 110001 Date: 03/06/2019

Subject Name: Chemistry

Time: 10:30 AM TO 01:00 PM Total Marks: 70

Instructions:

1. Attempt any five questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

Q.1 (a) Distinguish between softening & demineralization of water. With the help of a neat schematic diagram, describe ion exchange process for purification of water. 07

(b) Explain pitting & waterline corrosion. 07

Q.2 (a) Describe in brief, the manufacture of metallurgical coke by Otto Hoffman’s oven method. Also describe recovery of by-product & its advantage. 07

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(b) Define the terms: annealing, normalizing, hardening & tempering. 07

Q.3 (a) Describe preparation, properties & use of nylon-6 & polyester. 07

(b) Write the structure of natural rubber & gutta percha. What are the deficiencies of natural rubber? 07

Q.4 (a) Discuss various steps involved in electroless plating. Write down advantage of electroless plating over electro plating. 07

(b) Write a short note on: Public awareness for environment. 07

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Q.5 (a) What is hardness of water? How it is determined by EDTA method? 07

(b) Write a route on Bio Fuels & Bio Membrane: 07

Q.6 (a) Explain Injection moulding 07

(b) Answer in short: 07

1. Scales and Sludge.

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2. Rust.
3. Principle of Chromatography.
4. Different air pollutants.
5. Advantage of CNG over Gasoline and Diesel.
6. Ingredients of the Portland cement.

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7. Enzymes and its characteristic

Q.7 (a) Define the following: 07

1. Composition of Gasoline or Petrol.
2. Greases.
3. Acid refractories.

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4. Melt spinning.
5. Aerobic Fermentation.

(b) Reason it: 07

1. Rusting of iron is quicker in saline water than in ordinary water.
2. Neutrons preferred as a projectiles to carry out nuclear reaction.

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3. Radioactive wastes disposed off in salt mines.
4. Chloramine is preferable to bleaching powder or chlorine for sterilization of drinking water

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