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JEE Main Chemistry Class 11 Chemical Kinetics Part 2 Questions
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© examsnet.com
Question : 35
Total: 79
A first order reaction has the rate constant,
k
=
4.6
×
10
−
3
s
−
1
. The number of correct statement
∕
s
from the following is/are ________.
Given :
log
3
=
0.48
A. Reaction completes in
1000
s
.
B. The reaction has a half-life of
500
s
.
C. The time required for
10
%
completion is 25 times the time required for
90
%
completion.
D. The degree of dissociation is equal to
(
1
−
e
−
k
t
)
.
E. The rate and the rate constant have the same unit.
[25-Jan-2023 Shift 2]
Your Answer:
Validate
Solution:
t
10
%
=
1
K
ln
(
a
a
−
x
)
=
1
K
ln
(
100
90
)
t
10
%
=
2.303
K
(
log
10
−
log
9
)
t
10
%
=
2.093
K
×
(
0.04
)
Similarly
t
90
%
=
1
K
ln
(
100
10
)
t
90
%
=
2.303
K
t
90
%
t
10
%
=
1
0.04
=
25
e
k
t
=
a
a
−
x
a
−
x
a
=
e
−
k
t
1
−
x
a
=
e
−
k
t
x
=
a
(
1
−
e
−
k
t
)
α
=
x
a
=
(
1
−
e
−
k
t
)
© examsnet.com
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