Chemistry - Chemical Kinetics Question with Solution | TestHub

For $\mathrm{P}$, if ${\mathrm{t}}_{50\%}=\mathrm{x}$ then ${\mathrm{t}}_{75\%}=2\mathrm{x}$ This is true only for first order reaction. So, order with respect to $\mathrm{P}$ is $1.$ Further the graph shows that concentration of $\mathrm{Q}$ decreases with time. So rate, with respect to $\mathrm{Q},$ remains constant. Hence, it is zero order wrt Q. So, overall order is $1+0=1$