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The half life of a certain first order r...

The half life of a certain first order reaction is 60 minutes How long will it take for `80%` reaction to occur?

A

`139.39` min

B

`19.9` min

C

`199.39` hrs

D

40 min

Text Solution

Verified by Experts

The correct Answer is:
A
`k=(2.303)/(t)log((a)/(a-x))`
`(0.693)/(60)=(2.303)/(t)log((100)/(100-80))`
`:. t=199.39 min`
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