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Time required for 99.9\% completion of a first order reaction is times the time required for completion of 90\% reaction.(nearest integer)
3
First order: t = 2.303k [A]0[A]
t99.9\% = 2.303k 1000.1 = 2.303k 3
t90\% = 2.303k 10010 = 2.303k 1
∴ t99.9\%t90\% = 3
Answer: 3
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