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Q.

Chemical kinetics deals with rate of reaction, factors influencing rate,rate constant and factors influencing rate constant of a reaction. False statement among the following is

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a

As temperature increases, number of activated molecules increases.

b

K=PZe−EaRT,  ‘P’ is steric factor (or) orientation factor.

c

Rate constant of an exothermic reaction decreases with increase in temperature.

d

Rate of a first order reaction decreases with increase in time.

answer is C.

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Detailed Solution

As temperature ↑, number of activated molecules ↑ rate increases.   P= steric factor;  Z= collision frequency; A=PZ; K=A e-EaRT;Rate constant always increases with increase in temperature irrespective whether the reaction is exothermic or endothermic.For all non-zero order reactions rate of reaction decreases with time
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