In the case of a first order reaction, the ratio of the time required for 99.9% completion of the reaction to its half life is nearly

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answer is B.

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Detailed Solution

For first order reaction K=0.693t12=2.303logaa-x 0.693t12=2.303t99.9log100100-99.9=2.303t99.9log1000.1=2.303×3t99.9 t99.9=30.3t12=10t12

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