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A first order reaction is half completed...

A first order reaction is half completed in `45` minutes. How long does it need `99.9%` of the reaction to be completed

A

`7(1/2)` hours

B

20 hours

C

10 hours

D

5 hours

Text Solution

Verified by Experts

The correct Answer is:
A
`t_(99.9%) = 10 t_(50%)`
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