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In a first order reaction, the concentra...

In a first order reaction, the concentration of the reactant decreases form `0.8 M` to `0.4 M` in `15 min`. The time taken for the concentration to change form `0.1 M` to `0.025 M` is

A

`60` minutes

B

`15` minutes

C

`7.5` minutes

D

`30` minutes

Text Solution

Verified by Experts

The correct Answer is:
D
`t_(1//2) = 15` minute
`:. t = (2.303 xx 15)/(0.639)"log"(0.1)/(0.025) = 30 min`
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