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For a given reaction of first order it takes \( 20 \mathrm{~min} \). for the conc. to drop from \( 1.0 \mathrm{M} \) to \( 0.60 \mathrm{M} \). The time required
\( \mathrm{P} \) for the conc. to drop from \( 0.60 \mathrm{M} \) to \( 0.36 \mathrm{M} \) will be :

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(1) more than \( 20 \mathrm{~min} \)
(2) \( 20 \mathrm{~min} \)
(3) less than \( 30 \mathrm{~min} \)
(4) cannot tell.
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