Question

For a general chemical change, $2A+3B\to$ products, the rate of disappearance of A is $r_1$ and of B is $r_2$. The rate $r_1$ and $r_2$ are related as :-

• A. $3r_1=2r_2$
• B. $r_1=r_2$
• C. $2r_1=3r_2$
• D. $r_1^2=2r_2^2$

Answer 1

The correct option is A $3r_1=2r_2$

The rate of the reaction is $-\frac{1}{2}\frac{d\left[A\right]}{dt}=-\frac{1}{3}\frac{d\left[B\right]}{dt}$

$-\frac{1}{2}{r}_1=-\frac{1}{3}{r}_2$

$3r_1=2r_2$