The rate for a first order reaction is $0.639 \times 10^{- 2} m o l d m^{- 1} m i n^{- 1}$ and the initial concentration is 0.2 mol $d m^{- 3}$ . The half-life period is

1200 s

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0.33 s

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20 s

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600 s

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Solution

The correct option is A 1200 s
$0.639 \times 10^{- 2} = K \times 0.2 k = \frac{0693 \times 10^{- 2}}{0.2} t_{\frac{1}{2}} = \frac{0.693}{k} = \frac{0.693 \times 0.2}{0.693 \times 10^{- 2}}$
= 20 min = 1200 s

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