Chemistry - Chemical Kinetics Question with Solution | TestHub

For a zero order reaction, the rate is given by $r=k[A{]}^0=k$. Thus, the rate is independent of the concentration of the reactant.

The decomposition of acetaldehyde ($C{H}_{3}CHO\to C{H}_4+CO$) is a fractional order reaction with an order of $1.5$.

For a first order reaction, the half-life is given by $t_{1/2}=\frac{0.693}{k}$. This shows that the half-life is independent of the initial concentration of the reactant.

For a zero order reaction, the half-life is given by $t_{1/2}=\frac{[A{]}_0}{2k}$. This shows that the half-life is directly proportional to the initial concentration of the reactant.

Therefore, the only correct statement is that the half-life of a first order reaction is independent of the initial concentration of the reactant.

Answer: Half life of first order reaction is independent of initial concentration of reactant.