Question

For a hypothetical reaction $A\to B$, the rate constant is 0.25 $s^{-1}$, If the concentration of A is reduced to half, then the value of rate constant is :

• A. 0.25 $s^{-1}$
• B. 0.30 $s^{-1}$
• C. 0.075 $s^{-1}$
• D. 2.25 $s^{-1}$

Answer 1

Answer: (A)

0.25 $s^{-1}$

Rate constant for first order reaction is independent of initial concentration. Thus,
$k=0.25S^{-1}$