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Standard XII
Chemistry
Arrhenius Equation
The pre-expon...
Question
The pre-exponential factor in the Arrhenius equation of a second order reaction has the units:
A
m
o
l
L
−
1
s
−
1
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B
L
m
o
l
−
1
s
−
1
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C
s
−
1
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D
Dimensionless
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Solution
The correct option is
C
L
m
o
l
−
1
s
−
1
We know for rate constant,
k
=
A
e
−
E
a
/
R
T
----------- 1
Since
e
−
E
a
/
R
T
is dimensionless
So unit of
A
=
Unit of
k
.
∴
For second order reaction unit of A is
L
.
m
o
l
−
1
s
−
1
.
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0
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