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In a first order reaction, the concentra...

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 form 0.1 M to 0.025 M is :

A

30 min

B

15 min

C

`7.5` min

D

60 min

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A
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