Chemistry (M.Phil./Ph.D.) 2014 Panjab University Entrance Exam With Answers

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35.

For a certain first order reaction, it is found that is takes 156 seconds for the concentration of reactant to fall from 0.100 M to 0.0500 M. How much time would it take for the concentration of reactant to fall from 0.0500 M to 0.0250 M?

A: 312s
B: 76s
C: 156s
D: 436s

The answer is: C

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