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  • The half life of a chemical reactant is 20 minutes at a certain initial concentration. When concentration is reduced to one-half, half life is observed to be 10 minutes.

The half life of a chemical reactant is 20 minutes at a certain initial concentration. When concentration is reduced to one-half, half life is observed to be 10 minutes. Order of reaction is

 

Option: 1

Zero 


Option: 2

First


Option: 3

Second 


Option: 4

Third


Answers (1)

best_answer

Half-time of a reaction \mathrm{t_1/_2 = [Ao]^{1-n}}   where Ao is initial concentration of reactant and n is order of reaction with respect to that reactant.

Since, the time for half reaction gets halved on halving the initial concentration of the reactants, half-time is proportional to intial concentration.

\mathrm{\begin{aligned} & \Rightarrow 1-n=1 \\ & \Rightarrow n=0 \end{aligned}}.

Posted by

sudhir.kumar

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