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A first order reaction is found to have ...

A first order reaction is found to have a rate constant, `k = 4.2 xx 10^(-12) s^(-1)`. Find the half-life of the reaction.

A

`1.26 xx 10^(13)s`

B

`1.65 xx 10^(11)s`

C

`1.65 xx 10^(-11) s`

D

`1.26 xx 10^(-13) s`

Text Solution

Verified by Experts

The correct Answer is:
B
For the first order reaction
`t_(1//2)=(0.693)/(k)=(0.693)/(4.2xx10^(-12)s^(-1))`
`=1.65 xx10^(11)s`
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