Question

The rate equation for a reaction : $A \rightarrow B$ is $r = K[A]^\circ$. If the initial concentration of the reactant is a mol $dm^{-3}$, the half life period of the reaction is

• A. $\frac {a} {K}$
• B. $\frac {2a} {K}$
• C. $\frac {a} {2K}$
• D. $\frac {K} {a}$

Answer 1

Answer: (C)

$\frac {a} {2K}$

Answer 2

$A \longrightarrow B$ $\because\,\,\,\,\,r=k[A]^{0}$ or $\,\,\,\,\,\,r=k$ This is a zero order reaction. $\therefore \,\,\,\,\,t_{1 / 2}=\frac{a}{2 k}$