Published by:
CGP EDU Academic Team
Published on: August 13, 2026
Observe the following reactions at 
.
(I) A → products.
(II) 
Both the reactions are started at 10.00 am. The rates of these reactions at 10.10 am are same. The value of 
at 10.10 am is 
. The concentration of A at 10.10 am is 
. What is the first order rate constant (in 
) of reaction 
?
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
For reaction II:
,
The overall reaction rate is:
.
Given 
The reaction rate is 
.
Since the rates of both reactions are equal at 10.10 am and reaction I is first-order:
, so 
, giving 
.
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