For a reaction of order n, the unit of the rate constant is :

For the following graphs,


Choose from the options given below, the correct one regarding order of reaction is :

Isotope(s) of hydrogen which emits low energy $$\beta$$^$$-$$ particles with t_1/2 value > 12 years is/are

Consider the following reactions

A $$ \to $$ P₁ ; B $$ \to $$ P₂ ; C $$ \to $$ P₃ ; D $$ \to $$ P₄,

The order of the above reactions are a, b, c, and d, respectively. The following graph is obtained when log[rate] vs. log[conc.] are plotted
Among the following, the correct sequence for the order of the reactions is :