Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 1st And 2nd Sem New And Spfu 3110001 Chemistry Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? I & II (NEW) EXAMINATION ? WINTER 2019
Subject Code: 3110001 Date: 02/01/2020
Subject Name: Chemistry
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Marks
Q.1 (a) Define hardness of water and differentiate between temporary and
permanent hardness
03
(b) Explain the principle of UV-VIS spectroscopy and list down main
components of UV-VIS spectrophotometer.
04
(c)
Distinguish between addition and condensation polymerization and explain the
mechanism of free radical addition polymerization.
07
Q.2 (a) Draw a well labeled diagram of fractional distillation of crude petroleum
showing its various fractions.
03
(b) Answer the following
(i) CFC?s (Chlorofloro Carbons) are considered very stable. Draw the
Lewis dot structure of CF2Cl2 and explain for their stability.
(ii) Giving reason, arrange the following elements in increasing order of
electro negativity:
C,F,N,O
04
(c)
What do you understand by ?wet or electrochemical corrosion?? Explain
mechanism of electrochemical corrosion.
07
OR
(c)
(i) Explain how corrosion control can be brought about by the cathodic protection.
(ii) Alloying is done to improve usefulness of metals. Justify the statement.
07
Q.3 (a) Outline the applications of nanotechnology in catalysis 03
(b) State Lambert and Beer?s law and deduce its mathematical expression. 04
(c) Differentiate between proximate and ultimate analysis of coal and explain
proximate analysis giving its significance.
07
OR
Q.3 (a) What are the effects of nanoscale dimension on mechanical and optical
properties of material?
03
(b) Write a brief note on interaction of electromagnetic radiation with matter. 04
(c) (i) Octane number is used to predict about the efficiency of gasoline.
Comment on it.
(ii) Define calorific values of a fuel. Distinguish between gross and net
calorific value and give relation between these two.
07
Q.4 (a) What do you infer by following terms:
? Quantum dots
? Fullerenes
? Carbon nanotube
03
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? I & II (NEW) EXAMINATION ? WINTER 2019
Subject Code: 3110001 Date: 02/01/2020
Subject Name: Chemistry
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Marks
Q.1 (a) Define hardness of water and differentiate between temporary and
permanent hardness
03
(b) Explain the principle of UV-VIS spectroscopy and list down main
components of UV-VIS spectrophotometer.
04
(c)
Distinguish between addition and condensation polymerization and explain the
mechanism of free radical addition polymerization.
07
Q.2 (a) Draw a well labeled diagram of fractional distillation of crude petroleum
showing its various fractions.
03
(b) Answer the following
(i) CFC?s (Chlorofloro Carbons) are considered very stable. Draw the
Lewis dot structure of CF2Cl2 and explain for their stability.
(ii) Giving reason, arrange the following elements in increasing order of
electro negativity:
C,F,N,O
04
(c)
What do you understand by ?wet or electrochemical corrosion?? Explain
mechanism of electrochemical corrosion.
07
OR
(c)
(i) Explain how corrosion control can be brought about by the cathodic protection.
(ii) Alloying is done to improve usefulness of metals. Justify the statement.
07
Q.3 (a) Outline the applications of nanotechnology in catalysis 03
(b) State Lambert and Beer?s law and deduce its mathematical expression. 04
(c) Differentiate between proximate and ultimate analysis of coal and explain
proximate analysis giving its significance.
07
OR
Q.3 (a) What are the effects of nanoscale dimension on mechanical and optical
properties of material?
03
(b) Write a brief note on interaction of electromagnetic radiation with matter. 04
(c) (i) Octane number is used to predict about the efficiency of gasoline.
Comment on it.
(ii) Define calorific values of a fuel. Distinguish between gross and net
calorific value and give relation between these two.
07
Q.4 (a) What do you infer by following terms:
? Quantum dots
? Fullerenes
? Carbon nanotube
03
2
(b) Answer the following:
(i) Distinguish between hard acid/base and soft acid/base. Classify
following as hard acid/base or soft acid/base: Li
+
, SCN
-
, Al
3+
, Sn
4+
,
Au
+
, Pt
2+
F
-
, OH
-
(ii) Which atom has smaller atomic radii: Be (atomic number = 4) or
F(atomic number = 9). Give reason.
04
(c) Explain ethanol production using fermentation technology with a neat and
labeled process flow diagram, showing all the steps involved.
07
OR
Q.4 (a)
Give an outline of Bottom up approach of synthesis of nanomaterial
03
(b) Answer the following:
(i) Based on their positions in the periodic table, predict which has the
smallest first ionization energy: Li, Cs, N, F, I.
(ii) write coordination number and shape of [Ni(CN)4]
2-
(iii) Categorize following solids as covalent, ionic or metallic solids.
KF, Dry ice, Sand, Iodine, Diamond, Graphite.
(iv) sduoy uoy nI u give reason, why u cydcbubytuy dnIus iu s nuc nuc cnnoi .
04
(c) (i) Discuss the role of biotechnology in food industry and medicines
(ii) Give examples of following:
? A microorganism used as biofertlilizer
? A biosurfactant
? Organism used in acetic acid production.
07
Q.5 (a) Differentiate between ferrous and nonferrous alloys. 03
(b) What are the draw backs of natural rubber? How are its properties improved? 04
(c) Give a comparative account of Zeolite process and Ion exchange process
used for softening of water.
Calculate temporary and permanent hardness in ppm, for a water sample,
one litre of which show following result on analysis: Mg(HCO3)2 = 36.5
mg, Ca(HCO3)2 = 40.5 mg, NaCl=16.7 mg, CaSO4 = 17 mg, and MgSO4 =
15 mg.
07
OR
Q.5 (a) Answer the following:
(i) State Pilling bedworth rule and describe its significance.
(ii) The Copper equipment should not possess a iron nail in it. Give reason
03
(b) Explain the preparation, properties and any one specific use of the
following polymers:-
(a) Buna-S rubber
(b) Nylon-2-nylon-6
04
(c) Write principle of softening of hard water by Lime soda process.
Calculate the quantities (in Kg) of lime and soda required to soften 50,000
liters of hard water containing the following salts:-
MgCl 2 = 95 PPM; Mg(HCO 3) 2 = 146 PPM; CaSO 4 = 136 PPM; Ca(HCO 3) 2 =
162 PPM. Assume that the lime used is only 85% pure and soda is only 95%
pure.
(Given: Atomic mass of Ca = 40; Mg = 24; H =1; O =16; S =32; C=12; Cl
=35.5).
07
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This post was last modified on 20 February 2020