For the elementary reaction M $\to$ N, the rate of disappearance of M increases by a factor of 8 upon doubling the concentration of M. The order of the reaction with respect to M is

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Solution

The correct option is B 3
$\frac{r_{1}}{r_{2}} = \frac{1}{8} = \frac{[M]^{n}}{[2 M]^{n}} \Rightarrow n = 3$

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