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Question

In the reaction, P + Q ⟶ R + 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


A

2

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B
3
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C
1
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Solution

The correct option is C 1

Overall order of reaction can be decided by the data given t75=2t50

∴ It is a first order reaction with respect to P.

From graph [Q] is linearly decreasing with time, i.e., order of reaction w.r.t. Q is zero and the rate expression is r=[P]1[Q]0.

Therefore 1 is the right answer.

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