In a first order reaction, the concentration of the reactant, decreases from 0.8M to 0.4M in 15minutes.

Monjur Alahi

In a first order reaction, the concentration of the reactant, decreases from 0.8M to 0.4M in 15minutes. The time taken for the concentration to change from 0.1M to 0.025M is

(a) 30 minutes 

(b) 15 minutes

(c) 7.5 minutes 

(d) 60 minutes.


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Salim Ahmed Kawsar

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(a) : The concentration of the reactant decreases from 0.8M to 0.4M in 15 minutes,
i.e. t1/2 = 15 minute.
Therefore, the concentration of reactant will fall from 0.1M to 0.025M in two half lives.
i.e. 2t1/2 = 2 × 15 = 30 minutes.

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