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KCET 2014 Chemistry Solved Paper
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© examsnet.com
Question : 29
Total: 60
50
c
m
3
of 0.04 M
K
2
C
r
2
O
7
in acidic medium oxidizes a sample of
H
2
S
gas to sulphur. Volume of 0.03 M
KMnO
4
required to oxidize the same amount of
H
2
S
gas to sulphur, in acidic medium is
80
c
m
3
120
c
m
3
60
c
m
3
90
c
m
3
Validate
Solution:
For the oxidation of
H
2
S
to sulphur by
K
2
C
r
2
O
7
and
K
M
n
O
4
(
V
1
×
M
1
×
n
f
(
1
)
1000
)
K
2
C
r
2
O
7
=
(
V
2
×
M
2
×
n
f
(
2
)
1000
)
K
M
n
O
4
50
×
0.24
1000
=
V
2
×
0.15
1000
V
2
=
50
×
0.24
0.15
V
2
=
80
c
m
3
© examsnet.com
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