Consider the reaction, Cl2(aq)+H2S(aq)→S(s)+2H+(aq)+2Cl−(aq)The rate equation for this reaction is, Rate=k[Cl2][H2S]Which of these mechanisms is/are consistent with this rate equation? (I) Cl2+H2S→H++Cl−+Cl++HS−(slow)Cl++HS−→H++Cl−+S (fast)(II) H2S⇌H++HS−(fast equilibrium)Cl2+HS−→2Cl−+H++S(slow)
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a
(II) only
b
Both (I) and (II)
c
Neither (I) nor (II)
d
(I) only
answer is D.
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Detailed Solution
Slowest step is the rate determining step. Thus, in case (I), rate law is given as rate =k[Cl2][H2S]While for the reaction given in case (II), rate law is given as rate =k[H2S][Cl2][H+].Hence, only mechanism (I) is consistent with the given rate law.