AIIMS 2008
- Exam
- AIIMS
- Year
- 2008
- Subject
- Chemistry
- Chapter
- Chemical Kinetics
AIIMS 2008 · Chemistry · Chemical Kinetics
For the reaction, (2 NO_2+F_2 arrow 2 NO_2 F), following mechanism...
For the reaction, (2 \mathrm{NO}_2+\mathrm{F}_2 \rightarrow 2 \mathrm{NO}_2 \mathrm{ F}), following mechanism has been provided.
$$\begin{aligned}
& \mathrm{NO}_2+\mathrm{F}_2 \stackrel{\text{ Slow }}{\longrightarrow} \mathrm{NO}_2 \mathrm{ F}+\mathrm{F} \\
& \mathrm{NO}_2+\mathrm{F} \stackrel{\text{ Fast }}{\longrightarrow} \mathrm{NO}_2 \mathrm{ F}
\end{aligned}$$
Thus, rate expression of the above reaction can be written as
Options
- A(r=k\left[\mathrm{NO}_2\right]_2\left[\mathrm{~F}_2\right])
- B(r=k\left[\mathrm{NO}_2\right]\left[\mathrm{F}_2\right])
- C(r=k\left[\mathrm{NO}_2\right])
- D(r=k\left[\mathrm{~F}_2\right])
Correct answer
B. (r=k\left[\mathrm{NO}_2\right]\left[\mathrm{F}_2\right])
Step-by-step solution
Slowest step of mechanism decides the rate expression. Thus rate .