In a first order reaction, the concentration of the reactant, decreases from 0.8 M to 0.4 M in 15 minutes. The time taken for the concentration to change from 0.1 M to 0.025 M is
30 minutes
15 minutes
7.5 minutes
60 minutes.
As we learnt in
First Order Reaction -
The rate of the reaction is proportional to the first power of the concentration of the reaction
- wherein
Formula:
R P
a 0
a-x x
[differentiate rate law]
Unit of
for next condition
Option 1)
30 minutes
Correct option
Option 2)
15 minutes
Incorrect option
Option 3)
7.5 minutes
Incorrect option
Option 4)
60 minutes.
Incorrect option
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