For the first order reaction 2N_2O_5(g) 4NO_2(g) + O_2(g)

JEE Advanced 2011 Chemistry question

For the first order reaction

\mathrm{ → + }

(A)the concentration of the reactant decreases exponentially with time.Correct
(B)the half-life of the reaction decreases with increasing temperature.Correct
(C)the half-life of the reaction depends on the initial concentration of the reactant.
(D)the reaction proceeds to 99.6 % completion in eight half-life duration.Correct

Answer: (A),(B),(D)

Solution

(A) For a first-order reaction : an exponential decay. True. (B) ; the rate constant increases with temperature (Arrhenius), so the half-life decreases. True. (C) is

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Question ID VK-025954