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

Which of the following is correct for a zero-order reaction?

$A \rightarrow P$ is a zero order reaction. At $298 \ K$ the rate constant of the reaction is $1 \times 10^{-3} \ mol \ L^{-1} \ s^{-1}$. Initial concentration of '$A$' is $0.1 \ mol \ L^{-1}$. What is the concentration of '$A$' after $10 \ s$?

The rate constant for a zero order reaction is $2 \times 10^{-2} \ mol \ L^{-1} s^{-1}$. If the concentration of the reactant after $25 \ s$ is $0.5 \ M$,the initial concentration must have been $:-$ (in $M$)

The formation of gas at the surface of tungsten due to adsorption is a reaction of which order?

Which of the following is the incorrect equation for the rate constant of a zero-order reaction?