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

If the rate constant for a first order reaction is k, the time (t) required for the completion of 99% of the reaction is given by
  1. t=0.693/k
  2. t=6.909/k
  3. t=4.606/k
  4. t=2.303/k

Solution

k=2.303tlogaa-x

a=100

a-x=100-99=1

k=2.303tlog1001

t=4.606k

Asked in: NEET 2019 (All India)

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