Which statement about the half-life of reactions is correct?

Question

Accepted Answer

C. Half-life of a first order reaction is independent of initial concentration

1. For first order, $t_{1/2} = \dfrac{0.693}{k}$, with no concentration term.
2. So first order half-life is independent of $[R]_0$.
3. For zero order, $t_{1/2} = \dfrac{[R]_0}{2k}$, so it does depend on $[R]_0$.
4. Hence option C is correct and option B is the reverse of the truth.
_Source: NCERT Class 12 Chemistry Ch 3 "Chemical Kinetics", p.16_

Answer

Half-life of a first order reaction depends on initial concentration

Answer

Half-life of a zero order reaction is independent of initial concentration

Answer

Half-life of a zero order reaction is inversely proportional to k squared