$A$ substance (initial concentration $= a$) reacts according to zero order kinetics. The time taken for the completion of reaction is nearly

For a zero order reaction,a plot of $t_{1/2}$ versus $[A]_0$ will be

The unit of rate constant for a zero order reaction is

Give examples of zero order reactions.

Which of the following statements is correct about a zero order reaction?

The rate equation for a reaction $A \rightarrow B$ is $r=k[A]^{0}$. If the initial concentration of the reactant is $a \ mol \ dm^{-3}$,the half-life period of the reaction is