Half life of a first order reaction is 693 $s^{- 1}$ . Its rate constant will be ..............

0.01 s^{- 1}

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0.1 s^{- 1}

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0.001 s^{- 1}

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1.0 s^{- 1}

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Solution

The correct option is C $0.001 s^{- 1}$
$λ = \frac{l n 2}{t_{1 / 2}} = \frac{0.693}{693} = 0.001 s^{- 1}$
Hence,
option $(C)$ is correct answer.

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