West Bengal Institute of Technology (WBIT) 2010-1st Year B.Tech Electronics and Communications Engineering WBUT Engineering Chemistry - Question Paper
CS/B.Tech/SEM-2/CH-201/2010
Engineering Chemistry
Time Allotted : three Hours
Full Marks : 70
Name : *...v
Roll No. : .03.Utf.9.Q$P.*:$.
Invigilator's Signature:
CS/B .Tech/SEM-2 / CH-201/2010 2010
Time Allotted : 3 Hours Full Marks : 70
The figures in the margin indicate Jull marks.
Candidates are required to give their answers in iheir own words
as far as practicable.
GROUP - A ( Multiple Choice Type Questions }
1. Choose the correct alternatives for any ten of the following :
10 x 1 = 10
i) In the process of melting ice at -15C
a) AG<0AJy b) AG = 0
c) AG Ox? d) AG > 0.
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ii) One mole of an ideal gas expands isotheritialy, until its volume is doubled. What is the change in Gibbs energy' AG, for the process ?
a) R In 1/2 b) R In 2
RT In 1/2 d) RT In 2.
iii) If the enthalpy of reactant is less than that of pr< then
a) the reaction is exothermic
b) heat is evolved
c) the reaction is endothermic
d) none of these.
iv) The boiling point of p-nitrophenol is greater o-nitrophenol because of
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a) irvnir hnnHintf t |
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b)
c) van dei Wa?Us attractive forces
d) ecular H-bonding.
v) The at can act as a flexidentate ligand is
a) OH -
b) Ethylene diamine
c) NO.jf
d) S042-.
vi) The electrons trapped in anion vacancies in metal excess defects are known as
a) valence electrons
b)/ F-centres
c) mobile electrons
d) trapped electrons.
vii) Which of the following has the least bond angle ?
b) H20
a) NH
c) CH
d) BeF.
viii) The half-life period of a reaction is found to be directly proportional to the intial concentration. The order of reaction is
a) zero
b) one
d) three.
c) two
ix) A conducting polymer is
b) Polypropylene
d) Bakelite.
a) Polyethylene
c) Poiya2iiiir.te
x) The highest ranking coal is
b) Bituminous
a) Anthracite
c) Lignite
d) Peat.
The material used in the solar cell contains
W'"' Si
a) Cs
c) Sn
d) Ti.
An essential condition for a molecule to be IE active is
a) molecule be polar
b) molecule has an oscillating dipole moment
.0
c) molecule has a permanent dipole
d) none of these,
GROLvP - B { Short Angler Type Questions )
Answer any three of the following, 3x5=15
Prove that for an adiabatic reversible process, PVy = constant.
Show tnai for an ideal gs C - C = R, where the
j r
notations have their usual significance.
lain octane number and cetane number with their
ificanes.
:e down the mathematical form of Lambert-Beer Law. e.its significanes.
6. Show that Joule-Thompson effect is an enthalpic process. Explain the condition of heating and cooling.
GROUP -C ( Long Answer Type Questions }
Answer any three of the following. 3 x 15 = 45
7. a) What do you understand by HTC & LTC of a coal ? \S
Write down the usefulness of each process.
b) What are the important products formed from the atmospheric distillation of cn?
c) What is the importance of 'functional group region" in IR Spectroscopy ? Wh&</are the different absorption peaks possible for methanol & ethanol ?
d) What are the differences between p-type and n-type semiconductors ? 5 + 4 + 4 + 2
8. a) Define xmdensation polymerization with suitable exarrf>l~.
b) Explain mathematically Weight Average Molecular Weight.
o
c) What are raw rubber and vulcanized rubber ?
d) Explain Mesomeric Effect with example. 5.+ 3 + 4 + 3
9. a) What is anti-knocking compound ? Discuss the function
of TEL as anti-knocking agent. What is unleaded petrol ? Write its significance,
b) Why does benzene undergo electrophilic substitution rather than addition reaction ?
c) What is reference electrode ? Explain the working principle of one reference electrode. 6 + 4 + 5
10. Explain why :
a) Phenol is more easily nitrated than benzene.
b) CdCl 2 will induce Schottky defect if added to AgCl crystal.
c) NH 3, H 20 >md CH 4 have sp 3 hybridization but have different bond angles.
C' -
d) Areous copper sulphate solution ( blue colour} gives
a green precipitate with aqueous KF and
ii) bright green solution with aqueous KCI.
3+3+3+(2x3)
a) Hyperconjugation
b) Proximate analysis of coal
c) Gibbs-Duhem equation for a two component system
d) Optical isomerism and linkage iscm*msm in coordination compound.
e) Bathochromic shift and hypsochromic shift
f) Hydrogen bonding and its effect on properties of compounds.
2201 7
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| Earning: Approval pending. |
