Question

Consider a chemical reaction $2A+B\to A_{2}B$ the reactant A will decreases at:

• A. the same rate at which B will decreases.
• B. twice the rate at which B will decrease.
• C. half the rate at which B will decreases.
• D. twice the rate at which $A_{2}B$ will form.

Answer 1

Answer: (B), (D)

The correct options are
B twice the rate at which B will decrease.
D twice the rate at which $A_{2}B$ will form.

$-\frac{1}{2}\frac{d\left[A\right]}{dt}=-\frac{d\left[B\right]}{dt}=\frac{d\left[A_{2}B\right]}{dt}$.