Consider the reaction :
Cl2(aq) + H2S(aq) → S(s) + 2H+(aq) + 2Cl(aq)
The rate of reaction for this reaction is rate = k[Cl2][H2S]
Which of these mechanism is/are consistent with this rate equation ?
A. Cl2 + H2S → H+ + Cl + Cl+ + HS(slow)
Cl+ + HS→ H+ + Cl + S (fast)
B. H2S ⇔ H+ + HS (fast equilibrium)
Cl2 + HS→ 2Cl + H+ + S (slow)

(a) A only 

(b) B only

(c) Both A and B 

(d) Neither A nor B

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1 Answers

(a) :- The rate equation depends upon the rate determining step. The given rate equation is only consistent with the mechanism A.

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