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

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

The rate of a certain reaction depends on concentration according to the equation $-dc/dt = (K_1 C) / (1 + K_2 C)$. What is the order when concentration $(C)$ is very high?

For a zero order reaction,$A \longrightarrow \text{product}$,the concentration of $A$ decreases from $1.2 \ mol \ dm^{-3}$ to $0.4 \ mol \ dm^{-3}$ in $240 \ s$. What is the rate constant of the reaction?

Which of the following relations 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 $10 \ s$?