InterviewSolution
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InterviewSolution
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Consider the reaction, `Cl_(2)(aq) + H_(2)S(aq) rarr S(s) + 2H^(+) (aq) + 2Cl^(-)(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 ? (I) `Cl_(2) + H_(2)S rarr H^(+) + Cl^(-) + Cl^(+) + HS^(-)` (slow) `Cl^(+) + HS^(-) rarr H^(+) + Cl^(-) + S` (fast) (II) `H_(2)S hArr H^(+) +HS^(-)` (fast equilibrium) `Cl^(+) + HS^(-) rarr 2 Cl^(-) + H^(+) + S` (slow)A. (II) onlyB. Both (I) and (II)C. Neither (I) nor (II)D. (I) only |
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Answer» Correct Answer - D Slowest step is the rate determining step. Thus, in case (I), rate law is given as rate `= k[Cl_(2)][H_(2)S]` While for the reaction given in case (II), rate law is given as rate `= k[H_(2)S][Cl_(2)][H^(+)]^(-1)`. Hence, only mechanism (I) is consistent with the given rate law. |
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