$A$ 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

In which one of the following reactions,the rate constant has the unit $mol \ L^{-1} \ s^{-1}$?

$A \rightarrow B$
The above reaction is of zero order. The half-life of this reaction is $50 \ min$. The time taken for the concentration of $A$ to reduce to one-fourth of its initial value is $........... \ min$ (Nearest integer).

For a zero order reaction $A \rightarrow \text{product}$,a plot of $[A]$ (on $y$-axis) and time (on $x$-axis) gave a straight line with slope equal to $-3 \times 10^{-3} \ M \ min^{-1}$ and intercept equal to $2 \times 10^{-2} \ M$ (on $y$-axis). What is the rate constant (in $M \ min^{-1}$) of this reaction?

What is the unit of rate constant for the zero order reaction?