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Q.

A first order reaction is half completed in 45 minutes. How long does it need 99.9% of the reaction to be completed

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a

5 hours`

b

7.5 hours

c

10 hours

d

20 hours

answer is B.

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Detailed Solution

k=0.69345min⁡−1=2.303t99.9%log⁡100100−99.9a t99.9%=2.303×450.693log⁡103=448min⁡≈7.5 hrs
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