Law of mass action

Which of the following statements are correct: (i) law of mass action and rate law expressions - are same for single step reaction (ii) the slowest step of a complex reaction gives the order of the complex reaction (iii) both order and molecularity have normally a maximum value of 3 (iv) m olecularity of a com plex reaction A + 2B to C is 3

The low of mass action applicable to heterogenous equilibria.

In which of the following reaction, law of mass conservation is not valid

The law of conservation of mass was given by :