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NEET 2019
Exam
NEET
Year
2019
Subject
Chemistry
Chapter
Chemical Kinetics

NEET 2019 · Chemistry · Chemical Kinetics

If the rate constant for a first order reaction is k , the time ( t...

If the rate constant for a first order reaction is kk, the time (t)( t ) required for the completion of 9999 % of the reaction is given by

Options

  1. At=0.693/kt = 0.693 / k
  2. Bt=6.909/kt = 6.909 / k
  3. Ct=4.606/kt = 4.606 / k
  4. Dt=2.303/kt = 2.303 / k

Correct answer

C. t=4.606/kt = 4.606 / k

Step-by-step solution

k=2.303tlogaa−xk = \dfrac{2.303}{t}log\dfrac{a}{a - x}

a=100a = 100

a−x=100−99=1a - x = 100 - 99 = 1

k=2.303tlog1001k = \dfrac{2.303}{t}log\dfrac{100}{1}

t=4.606kt = \dfrac{4 .606}{k}

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