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Q.

A first order reaction is 20% complete in 10 min. The rate constant of the reaction is

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a

2.23 min-1

b

22.3 min-1

c

0.0223 min-1

d

0.223 min-1

answer is B.

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Detailed Solution

log⁡[A]f[A]0=−k2.303t  i.e.  log⁡0.8=−k2.303(10min)

or k=−2.30310minlog⁡(0.8)=0.0223min−1

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