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Q.

Half life period for a first order reaction is 20 minutes. How much time is required to change the concentration of the reactants from 0.08 M to 0.01M

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a

20 minutes

b

40 minutes

c

60 minutes

d

50 minutes

answer is B.

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Detailed Solution

0.69320=2.303t1/2log100.080.01

0.69320=2.303t1/2log108

0.69320=2.303t1/2log1023

0.69320=2.303×3log102t1/2

0.69320=3×0.693t1/2

t1/2=3×20

=60 min

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