Consider the following reaction:
`A to` Products
This reaction is completed in 100 min.
The rate constant of this reaction at `t_(1)= 10 min`, is `10^(-2)mi n^(-1)`. What is the rate constant `("in "mi n^(-1))` at `t_(2)= 20 min` ?

Options

A. `2xx10^(-2)`
B. `10^(-2)`
C. `5xx10^(-3)`
D. 0.1

Answer

B

Explanation

Rate constant does not depend on concentration for a first order reaction and therefore,
Rate constant at `t_(1)`= 10 min = Rate constant at `t_(2)`= 20 min.
Rate constant at 20 min `= 10^(-2) mi n^(-1)`.