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If the rate constant for a first order r...

If the rate constant for a first order reaction is k, the time (t) required for completion of 99 % of the reaction is given by

A

`t=2.303//k`

B

`t = 180.693//k`

C

`t = 6.909//k`

D

` t= 4.606//k`

Text Solution

Verified by Experts

The correct Answer is:
D
Hint: `t = 2.303//k log [R]_0//[R]`
` [R] = [R]_0 - 0.99 [R]_0 [R] =0.01 [R]_0`
`t = 2.303//k log 100 implies 2.303 xx 2//k = 4.606 k`
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