CLASS: B.Sc. CHEMISTRY
11A/138
St. JOSEPH’S COLLEGE (AUTONOMOUS) TIRUCHIRAPPALLI – 620 002
SEMESTER EXAMINATIONS – APRIL 2011
TIME: 3 Hrs.
MAXIMUM MARKS: 100
SEM
SET
PAPER CODE
TITLE OF THE PAPER
VI
2008
08UCH630304
CORE ELECTIVE: ESSENTIALS OF GENERAL
CHEMISTRY
SECTION – A
Answer all the questions:
20 x 1 = 20
Choose the correct answer:
1.
Alkyl halides undergo _________.
a) Electrophilic substitution reactions
b) Electrophilic addition reactions
c) Nucleophilic substation reactions
d) Nucleophilic addition reactions
2.
Which of the following is NOT an oxidant?
a) SeO2
c) LAH
b)
d)
CrO3
KMnO4
Al2O3  2SiO2  2H2O is _________.
a) Kaolinite
c) Biedellite
b)
d)
Illite
Halloysite
The point group of benzene is _________.
a) C2v
c) Dh
b)
d)
C3v
None of these
3.
4.
5.
_________ stops as soon as the incident radiation is cut off.
a) Fluorescence
b) Phosphorescence
c) Chemiluminescence
d) None of these
Fill in the blanks:
6.
Ethyl alcohol on heating with con. H2SO4 at 170C gives _________.
7.
An example for galvanic corrosion is _________.
8.
The term ceramics means _________.
9.
An example for a chiral molecule is _________.
10.
For a reaction that obeys Einstein law, the quantum yield is equal to _________.
State True or False:
11.
CH3CH2NHCH3 is a secondary amine.
12.
Whiteware product consists of a refractory body and a glossy coating called glaze.
13.
The corrosion of iron and iron based alloys is known as rusting.
14.
For endothermic reactions, HP > HR.
15.
The emission of light as a result of chemical reaction is called fluorescence.
Answer in one or two sentences:
16.
What is Tollen’s reagent?
17.
What are oxidants?
18.
Define umpolung reaction.
19.
State Hess’s law.
20.
Define Stark-Einstein law.
SECTION – B
Answer all the questions:
21.
a.
5 x 4 = 20
i) Arrange the following in the order the increasing acidity and explain your answer.
HCOOH, ClCH2COOH, CH3COOH
ii) What happens when acetic acid is treated with PCl5?
OR
CHCl 3/NaOH
b.
?
i) C6H5OH
?
H2SO4
KMnO 4
?
ii) CH3CH 2CH 2
OH
SOCl 2
?
Predict the product for the above reactions.
22.
a.
What are synthons and synthetic equivalents? Explain with examples.
OR
23.
b.
State the advantages of electrochemical series.
a.
Write a note on matrix phase.
OR
24.
b.
Discuss the manufacture of whitewares.
a.
Describe the optical activity and dipole moment on the basis of symmetry.
OR
25.
b.
List out the properties of a group.
a.
Define Quantum Yield. Explain the causes of low quantum yield.
OR
b.
Explain the working of Fricke Dosimeter.
SECTION – C
Answer any FOUR questions:
26.
4 x 15 = 60
a.
Explain the relative stability of primary, secondary and tertiary carbonium ions and
carbanions.
(7)
b.
Predict the product:
i) Me-C=O
NH 3
?
H2
?
Ni
H
ii) CH3CH2CH2Cl
KOH
OH
?
alc. KOH
?
EtO
-
H2O2/OH
?
iii) CH3CH2C=CH
Cl2
?
CH3NH2
?
EtOH
?
iv) CH3CH2COOH
27.
a.
Discuss the various methods of prevention of corrosion.
(8)
b.
Predict the produces (A  G)
(7)
CH 2CH 3
-
alc. KOH
h
OH
C
B
A
Cl 2 (C8H9Cl)
(C8H8)
(C8H10 O)
GG
(C7H5ONa)
+
I2/NaOH
F
(C8H8O)
(C7H5O2Na)
28.
29.
H /H2O
E
(C8H6)
alc. KOH
D
(C8H8Br 2)
a.
What are composite materials?
(7½)
How are they classified?
b.
Write
(7½)
specialized
a.
Derive the integrated form of Kirchoff’s equation.
b.
Predict the point group for the following molecules.
a
short
note
on
ceramic
(7)
a.
Discuss the kinetics of hydrogen-chlorine reaction.
(8)
b.
Describe the radiolysis of water vapour.
(7)
**************
Give a brief account.
products.
i) CHCl3 ii) Pyridine iii) Acetylene iv) Staggered ethane. (8)
30.
Br 2/CCl 4
(Any
FIVE)