Chemistry - Chemical Kinetics Question with Solution | TestHub

The decomposition of hydrogen peroxide is a well-known example of a first-order reaction. The rate law is given by Rate = $k[{\mathrm{H}}_2{\mathrm{O}}_2]$.

The decomposition of acetaldehyde (${\mathrm{CH}}_3\mathrm{CHO}$) is a fractional order reaction (order = $1.5$).

The reaction between ${\mathrm{NO}}_2$ and ${\mathrm{F}}_2$ is a second-order reaction.

The reaction between $\mathrm{NO}$ and ${\mathrm{H}}_2$ is a third-order reaction.

Therefore, $2{\mathrm{H}}_2{\mathrm{O}}_{2(\ell )}\to 2{\mathrm{H}}_2{\mathrm{O}}_{(\ell )}+{\mathrm{O}}_{2(\mathrm{g})}$ is the correct example of a first-order reaction.

Answer: $2{\mathrm{H}}_2{\mathrm{O}}_{2(\ell )}\to 2{\mathrm{H}}_2{\mathrm{O}}_{(\ell )}+{\mathrm{O}}_{2(\mathrm{g})}$