Q. In the reaction $2A + B \rightarrow A_{2}B,$ if the concentration of $A$ is doubled and of $B$ is halved, then the rate of the reaction will

A) Increase by two times
B) Decrease by two times
C) Increase by four times
D) Remain the same
Explanation

(a)
$2A + B \rightarrow A_{2}B$
$r_{1} = k\lbrack A\rbrack^{2}\lbrack B\rbrack$
$r_{2} = k\lbrack 2A\rbrack^{2}\lbrack B/2\rbrack$
Or $\ r_{2} = 2k\lbrack A\rbrack^{2}\lbrack B\rbrack$
$\therefore r_{2} = 2r_{1}$

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.