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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 :

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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 : A. t = 2.303 / k t B. t = 0.693 / k t C. t = 6.909 / k t D. t = 4.606 / k t Select the correct answer from above options

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Correct Answer - D The 1 s t 1 order reaction t = 2.303 k log ( a a − x ) t = 2.303 k log ( 100 100 − 99 ) = = 2.303 K log 10 2 = = 2.303 k × 2 × log 10 = 2.303 k = 4.606 k 2.303

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