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Question

In the reaction, P + Q R + S, the time taken form 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 :


Your Answer
A
2
Your Answer
B
3
Correct Answer
C
1

Solution

The correct option is D 1
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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