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

Options

  1. AB only
  2. BBoth A and B
  3. CNeither A nor B
  4. DA only

Correct answer

D. A only

Step-by-step solution

Rate equation is to be derived wrt slow Step from mechanism (A) Rate = k [ Cl ₂ ] [ H ₂ ~S ]

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