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Question
Chemistry
A first order reaction completes 60 % in 20 minutes. The time required for the completion of 90 % of the reaction is approx
Q. A first order reaction completes
60%
in
20
minutes. The time required for the completion of
90%
of the reaction is approx
3713
202
Chemical Kinetics
Report Error
A
30 minutes
B
40 minutes
C
50 minutes
D
60 minutes
Solution:
K
=
t
2.303
lo
g
100
−
x
100
K
=
20
2.303
lo
g
100
−
60
100
...
(
i
)
K
=
t
2.303
lo
g
100
−
90
100
...
(
ii
)
(
i
)
(
ii
)
K
=
t
2.303
l
o
g
10
100
K
=
20
2.303
l
o
g
40
100
→
t
1
lo
g
10
=
20
1
[
lo
g
10
−
lo
g
4
]
⇒
t
1
×
1
=
20
1
[
1
−
0.6020
]
∴
t
=
50
minutes