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8/20/2019 2nd PU Chemistry July 2015.pdf
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34
(NS)
ii)
Part
-
A carries
1
0
marks.
Each
question
canies
one
mark.
Part-
B carries
1
A
marks.
Each
question
carriestwo
ma*s.
P a
rl
-
C
c a
rri
es
1
5
m arks.
Ea
c
h
qu
estion
canies
th
re
m
arl<s.
Part
-
D carries
35
marks. Each
guestion
carriesfive
marks,
iii)
Write balanced
chemical equations
and-Qqw
diagrams
wherevernecessary.
iv)
Use
log
tables and
the simple
(06n4t
fllse
of
scientific
calculator
is ilot allowed.l
=l
*:Tilttu
ttttt
tttttllltt
ll tul
7"1)uL
(Ensrishversion)
T
D2
C
caper
has
v;ffiffiF{i,
u,,
compulsory.
PARr-A
aiN-fu
lf
\-/:-
I
.
Answer all
the
questions.
Each
question
carries
one
mark.
(Answer
each
question
in
one
word or
one
sentence).
(10x1
=10)
1)
On
what factorthe
value of colligative
property
depends
?
2)
Give an
example
for
liquid
solution
in
which
solute
is
gas.
3)
How many Coulombs
of
electricity
required to
oxidise one
mole of
Alto
Al3+ ?
4) ln azeroorder
reaction,
the time taken
to
reduce the concentration
of
reactant
from 50 %
to
25
o/o
is 30 minutes.
What is the
time
required
to
reduce the
concentration
f rom 25
o/o
lo
12.5
"/"
?
5)
Name
the enzyme
used
in
the inversion
of cane
sllgar.
Second PUC Chemistry July, 2015 Question Paper
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34
(NS)
6) V\fhich
nietal
is
refined
by
Van-4rkel
method
?
7)
Name
the
noble
gas
which
does not
have
general
noble
gas
configuration
ns2
np6.
B) R-X+l'rlal
^."%,
R-t+NaX
What
is
the name
of reaction
?
Which
oxldising
agent
used in Etard-reaction
?
Write
the
generalstructure
o{
Zwitter
ion.
PART-
B
ll.
Answeranyfive
of the
following.
Each
question
carries
two
marks.
11)
Give
anytwo
differences
between
Frenketand Schottky defects.
12')
State:
i)
Kohlrausch's
law
ii)
Faraday
first law
of
electrolysis
(5x2=10)
13)
Calculate
the half-life period
of
a first
order reaction,
if
the
rate
constant
of
the reaction
is
6.g3
x 10-3
S-1.
14)
Give
reasons:
'
i)
Actinoids
showvariable
oxidation
states.
ii)
Cerium
(Ce)
exhibits
+4
oxidation
state.
-1G
e)
10)
:.
./
l\
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__
34
(NS)
a)
Write
the,luPAC
narne
of rnajor
product
formed
in
FriedelCrafts
acylation
of
anisole.
b)
Complete
the
reaction
l
t.
ocH3
I
--
LU
+Hl
---->
How
are carlcoxytic
acid
prepared
from
Grignard
reagent
?
What are
antibiotics
?
Give an example.
What
is
Saponification
?
Give
the
equation
to form
sodium stearate
by
this
method.
PART.C
lll.
Answer
any,tive
of the fotlowing.
Each
question
carriesthree
marks.
(5x3=15)
.:
19)
Explain
the
reducing
behaviour
cif
carbon in
the
extraction
of
iron
using
20)
a) Name
the'gas liberated
when
zinc
reactswith
dil. HNog
b)
Give
.eason
:
-1
1-
,l
Lj
I
16)
17)
18)
ri
rl
l
:i)
PHB
has lower
boiling
pointthan
NH,
ii)
Nitrogen
is
less
reactive
at roorn
temperature.
(1+2)
,
l
rl
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34
(NS)
21\
-12.
Give
the
principles
involved
in
the
manutacture
of
sulphuric
acid
by
contact
lrmllllillillilt
process
with
equations.
2\
a)
Complete
the
reaction
Cl, +
2H2O
+
SO,
-----)
b)
i)
Which
halogen
has
highestelectron
affinityqelectron
gain
enthalpy?
ii)
Give
the
structure
of
perchtoric
acid.
23)
a)
3d-series
etements
exhibitvariable
oxidation
states.
why
?
b)
Calculate
the
magnetic
moment
of
Mn2+
ion.
[Atomic
number
of
Mn
=
25].
24)
Describe
the
manufacture
of
potassium
dichromate
from
chromite
ore.
'(1+2;
(1+2)
\
t
aS
25)
with
the
help
of Valence
Bond
Theory
UBT)
explain
hybridisation,
geometry
and
magnetic
properv
of
[coFu]r-,
hexafruoridocobartate
(ilr)
ion.
[Atomic
number
of
Co
_
Zt]
26)
a)
What is
the
tupAC
name
ot
[cr1Nn.).
(Hro).]
ct,
r
b)
Give the
facial (fac)
and
meridional
(mer)
isomeric
structures
of
[co6n.;.
(Nor).]
(1+2)
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-13-
PART-
D
r-
34
(r\rs)
lV.
Answer
any
three
of the following.
Each
question
carriesf ive
marks.
(3xS=1S)
27)
a)
Calculate
the
packing
efficiency
in Body
Centred
Cubic
(BCC)
lattice.
b)
An
element having
atomic
mass
107.9
gmoFt
has
fcc
unit
cell. The
edge
length
of unit
cell
is
408.6
pm.
Catculate
the density
of
the
unit
cell.
.:
[Given
NA
=
6.022x
1023
mol-l].
(3+2)
z\f)
The boiling point
of benzene
is
353.23
K
when
1.80 g
of
a
non-volatite,
/
non-ionising
solute was
dissolved
in
90
g
of benzene,
the
boiling
point
is
raised
to
354.1 1
K.
calculate
the
motar
mass
of
the
solute.
[Given
Ko for
benzene
=
2.53
K
kg
mol-t]
b) Write
two
differences
between
idealand
non-idealsolutions.
(3+z)
/
29/
a)
Draw
the neat
labelled
diagram
of
Standard
Hydrogen
Electrode
(St-lE)
/-
/
and
write
its
symbolic
representation.
b)
Calculate
the
emf
of
the
cell
in
which
the following
reaction
takes
place
Ni(r)
+
ZAglo.oorrur
+Nito1,uo,+
?-Ag1s1
i
[Given
F3",,
=
1.05
V]
(2+3]
Derive
integrated
rate
equation
for
rate
constant
of zero
order
reaction.
Showthatthe
rate
of
first
order reaction
is
doubled
when
concentration
of
the reactant
is
doubled.
(B+2)
30)
a)
b)
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_
34
(NS)
.1+
31)
a)
i)
Give
any
two
characteristics
of
chemisorption.
ii)
What
is
meant by selectivity of
a
catalyst
?
b)
Define:
i)
Brownian
movement
ii)
Tyndatteffect.
V'
Answer
any
four
of
the
following.
Each
question
carries f
ive
marks.
32)
a)
i)
Exptain
the
SNz
mechanism.
c)
What
are
enantiomers
?
33)
a)
Explain
the
Kolbe,s
reaction.
b)
Complete
the reactions
:
,
i)
R-cH2-oH-#il
I
ii)
@
ton'f*o.,
write
the
general
equation
of
wiiliamson's
ether
synthesis.
ii)
What
is
the reagent
used
in
the
conversion
of
alkyl halide
into
alkene
?
b)
Comptete
the reaction
CH.-CHr-Br+AgCN--T-
(3+2)
(4x5
=
20)
(3+1+1)
c)
(2+2+11
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34
(NS)
a)
How
would
you
prepare
acetaldehyde
from
acetyl
chloride. Name
the
reaction.
b)
Name the reagent
used in the
conversion
of
ketone to hydrocarbon.
Name
the
reaction.
c)
Acetaldehyde
does not undergo
Cannizzaro's
reacJion.
Why
?
(2+2+1\
35) a) Name
the
major
product
formed when
nitrous
acid
is
treated
with
i) methylamine
ii)
aniline at
low
temperature.
b)
Explain
the Hoffmann's
bromamide reaction.
c)
Write
the IUPAC name
of
(CH3)2
N
-
CH2
-
CHs
.
36) a) Givethe Haworth
structure
of lactose.
b) What are
hormones
?
Give
an example.
c)
Which
nitrogenous
base
present
in
DNA
but not in RNA
?
37)
a)
How is
neoprene
prepared
?
b)
What
are
bio-degradable
polymers
?
Give exampte.
c) What
is
vulcanisation
?
(2+2+1)
(2+2+11
(2+2+11
-15-
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