Which among the following is an example of a zero order reaction?

The unit of rate constant for a zero order reaction is

What is the value of the slope of a graph obtained by plotting the concentration of reactant $[A]_t$ versus time for a zero order reaction?

For a zero-order reaction with rate constant $k$,the slope of the plot of reactant concentration against time is

At high pressure,the following reaction is zero order:
$2NH_{3(g)} \xrightarrow[Pt \ \text{catalyst}]{1130 \ K} N_{2(g)} + 3H_{2(g)}$
Choose the option which is not true with respect to the reaction,from the choices given below:

For a zero order reaction,which of the following statements is false?