Question

For the reaction: $2A+B\to 3C+D$. Which of the following does not express their action rate?

• A. -$\frac{d\left[C\right]}{3dt}$
• B. -$\frac{d\left[B\right]}{dt}$
• C. $\frac{d\left[D\right]}{dt}$
• D. -$\frac{d\left[A\right]}{2dt}$

Answer 1

The correct option is A -$\frac{d\left[C\right]}{3dt}$

$2A+B\to 3C+D$

According to rate law :

$\frac{-1d\left[A\right]}{2dt}=\frac{-d\left[B\right]}{dt}=\frac{1}{3}\frac{d\left[C\right]}{dt}=\frac{d\left[D\right]}{dt}$

Hence, the wrong option is $\frac{-d\left[C\right]}{3dt}$