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In the reaction, P+Q rarr R+S the time...

In the reaction, `P+Q rarr 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

B

3

C

0

D

1

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