1.

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. A onlyB. B onlyC. Both A and BD. Neither A nor B

Answer» Correct Answer - a
For A
Rate = `k (Cl_(2)) (H_(2)S)` (By slow step)
For B
Rate = `k[Cl_(2)][HS^(-)]`
`k_(eq) = ([H^(+)][HS^(-)])/([H_(2)S])` (according to equilibrium)
Rate = `k[Cl_(2)] (k_(eq)[H_(2)S])/([H^(+)])`
Rate = `kk_(eq)[Cl_(2)] ([H_(2)S])/([H^(+)])` .


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