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: (NEET 2019)

First order rate constant is given as, 0 2.303log t A k t A 99% completed reaction, 2.303 100 log 1 k t 2 2.303 log10 t 2.303 2log10 k t x 2.303 4.606 2 t k k x 4.606 t k