Q. The rate equation for the reaction $2A + B \rightarrow C$ is found to be Rate=k[A][B] The correct statement in relation to this reaction that the
A) Unit of k must be $s^{- 1}$
B) $t_{1/2}$ is constant
C) Rate of formation of C is twice the rate of disappearance of A
D) Value of k is independent of the initial concentration of A and B
Explanation
(c)
$2A + B \rightarrow C$
Rate=k[A][B]
It represents second order reaction.
Thus , unit of k is $M^{- 1}S^{- 1}$
$\therefore$ (a) is false
$T_{50}$ is dependent of concentration but not constant
$\therefore$ (b) is false
$- \frac{1}{2}\frac{d\lbrack A\rbrack}{dt} = \frac{d\lbrack C\rbrack}{dt},$
thus (C)is correct
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.