Doubt from chemical kinetics

15725748617797704575383921840938 ques 37 ans is C.

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Thank you... but it is actually 10^-5. The approach was needed though..

I’m sorry for that :sweat_smile: Till second last step i have written 10^-5 and then suddenly for the answer I don’t know why i have written 10^-3 :joy:

The approach was important..i got what was required. Thank u...

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