Consider the reaction, Cl 2 (aq) + H 2 S (aq) → S (s) + 2H + (aq) + 2Cl – (aq) The rate…
Chemistry · JEE Main · NTA Exams — Chemical Kinetics
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 ?
(A) Cl2 + H2S → H+ + Cl– + Cl+ + HS– (slow)
Cl+ + HS– → H+ + Cl– + S (fast)
(B) H2S \(\text { ⇌ }\) H+ + HS– (fast equilibrium)
Cl2 + HS– → 2Cl– + H+ + S (slow)
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 ?
(A) Cl2 + H2S → H+ + Cl– + Cl+ + HS– (slow)
Cl+ + HS– → H+ + Cl– + S (fast)
(B) H2S \(\text { ⇌ }\) H+ + HS– (fast equilibrium)
Cl2 + HS– → 2Cl– + H+ + S (slow)
- (B) only
- Both (A) and (B)
- Neither (A) nor (B)
- (A) only
Answer
(D) (A) only
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