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Consider the reaction CI(2) (aq)+H(2)S...

Consider the reaction
`CI_(2) (aq)+H_(2)S(aq) rarr S(s)+2H^(+)(aq) +2CI^(-1)(aq)`
The rate equation for this reaction is rate =` k[CI_(2)] [H_(2)S]`
Which of these mechanisms is /are consistent with this rate equation ?
`CI_(2)+H_(2)S rarr H^(+)+CI^(-)+CI^(+)HS^(-)` (slow )
`CI^(+)+HS^(-)+CI^(-)+S` (fas)
`H_(2)S rarr H^(+)+HS^(-)` (fast equilibrium )
`CI_(2)+HS^(-) rarr 2CI^(-)+H^(+) +S` (slow )

A

Neither (i) nor (ii)

B

(i) only

C

(ii) only

D

Both (i) and (ii)

Text Solution

Verified by Experts

The correct Answer is:
B
(B) `CI_(2(aq))+H_(2) S_((aq))rarrS_((s))+2H_((aq))^(+)+2CI_((aq))^(-)`
`R= k [CI_(2)][H_(2)S]`
Since rate of reaction depends only on the slow step
`:.` Mechanism (A) is correct .
`CI_(2)+H_(2)S rarr H^(+)+CI^(-)+CI^(+)+HS^(-)` (slow)
`CI^(+) +HS^(-)+CI^(-)+S` (fast )
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