A first order reaction takes 69.3 minute...

A first order reaction takes `69.3` minutes for `50%` completion. How much time will be needed for `80%` completion?

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The correct Answer is:

A

`0.693/69.3=k`
`t=(2.303)/kxx"log"(R_(0))/Rimpliest=(2.303xx69.3)/0.693"log"100/20implies160.98` min

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