Mechanism
1Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
       Â
                Â
NO + Cl2 --> NOCl + Cl    Â
SLow step   slow step is rate determining step
                        Â
       Â
              Â
NO + Cl --> NOCl
        fast step
           Â
--------------------------------------------------------------------------------
                                    Â
2 NO(g) + Cl2(g) --> 2 NOCl (g)Â Â Â
over all reaction
NO + Cl2 --> NOCl +
Cl     SLow step   slow step
is rate determining step   of rate limiting step
b. any intermediates  . Cl is intermediate
c. no catalyst