Chemical Kinetics - Result Question 24

####24. In the reaction, P+QR+S, the time taken for 75 reaction of P is twice the time taken for 50 reaction of P. The concentration of Q varies with reaction time as shown in the figure. The overall order of the reaction is

(2013 Adv.)

(a) 2

(b) 3

(c) 0

(d) 1

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Answer:

Correct Answer: 24. (a)

Solution:

  1. PLAN Time of 75 reaction is twice the time taken for 50 reaction if it is first order reaction w.r.t. P. From graph, [Q] decreases linearly with time, thus it is zeroth order reaction w.r.t. Q

dxdt=bk[P]a[Q]b  Order w.r.t P=a=1  Order w.r.t Q=b=0

Thus, overall order of the reaction =1+0=1



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