The half life of a first order reaction is 69.35 seconds, the value of rate constant of the reaction is:

1.0 s^{- 1}

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0.1 s^{- 1}

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0.01 s^{- 1}

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0.001 s^{- 1}

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Solution

The correct option is D $0.01 s^{- 1}$
The half life of first order reaction is given as :

$t_{1 / 2} = \frac{0.693}{k}$

$∴ k = \frac{0.693}{69.35} = 0.01 s^{- 1}$

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