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JEE Advanced 2020 Full Test 7 Paper 2
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© examsnet.com
Question : 25
Total: 54
Consider a parallel reaction,
Which of the following statement(s) is/are true?
When both the reactions are of
1
st
order,
k
1
k
2
=
[
X
]
[
Y
]
k
1
k
2
=
[
X
]
[
Y
]
is true for all parallel path reactions irrespective of their order.
The overall energy of activation is given by
E
=
k
1
E
1
+
k
2
E
2
E
1
+
E
2
,
if the two parallel reactions are of same order.
For first order reaction, the plot of
ln
t
1
∕
2
vs
1
∕
T
is a straight line and slope of the line is equal to E\/R (where
R
is gas constant).
Validate
Solution:
The ratio of
[
X
]
[
Y
]
is a constant equal to
k
1
k
2
,
only when order is same for both parallel reactions.
The overall energy of activation,
E
=
k
1
E
1
+
k
2
E
2
k
1
+
k
2
For parallel first order reaction, In
t
1
∕
2
=
ln
(
0.693
A
)
+
E
R
(
1
T
)
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