####19. When initial concentration of the reactant is doubled, the half-life period of a zero order reaction
(a) is halved
(b) is doubled
(c) remains unchanged
(d) is tripled
(b) $(t _{1 / 2}) _{\text{zero }}=\frac{[A]_0}{2 k}$
$ \begin{equation*} \therefore \text{ If }[A] _{o}=\text{ doubled, } t _{1 / 2}=\text{ doubled } \tag{1} \end{equation*} $
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