Question

The rate constant is numerically the same for three reactions of first, second, and third order respectively. Which one is true for rate of three reactions, if concentration of reactant is greater than $1 \,M$ :

• A. $r_{1}=r_{2}=r_{3}$
• B. $r_{1} >r_{2} >r_{3}$
• C. $r_{1}< r_{2}< r_{3}$
• D. all of these.

Answer 1

Answer: (C)

$r_{1}=k[ A ]^{1}$
$r_{2}=k[ A ]^{2} ; r_{3}=k[ A ]^{3}$
If ${[A]>1 ; r_{3}>r_{2}>r_{1} }$