JEE Main Chemistry question
Consider the reaction, Cl_2(aq)+H_2S(aq)\rightarrow S(s)+2H^+(aq)+2Cl^-(aq). The rate equation for this reaction is rate .
Which of these mechanisms is/are consistent with this rate equation?
(A) Cl_2+H_2S(aq)\rightarrow H^+Cl^-+Cl^++HS^- (slow); (fast)
(B) (fast equilibrium); (slow) [AIEEE 2010]
Answer: (D)
Solution
The rate law must be governed by the slowest step. In mechanism (A), the slow step is Cl_2+H_2S\rightarrow H^+Cl^-+Cl^++HS^-, giving rate , which matches the given rate law. In mechanism (B), the slow step is
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