MCQ
Zeise's salt is
- A${\text{Fe(}}{\eta ^5} - {C_2}{H_5}{)_2}$
- B${\text{Cr(}}{\eta ^6} - {C_6}{H_6}{)_2}$
- ✓${\text{K[Pt(}}{\eta ^2} - {C_2}{H_4})C{l_3}]$
- D${\text{K[Pt(}}{\eta ^2} - {C_2}{H_4}{)_2}C{l_2}]$
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[Given $K _{ b }$ for $\left.\left( H _{2} O \right)=0.52\, K\, kg\, mol ^{-1}\right]$

$Cl_2(aq) + H_2S(aq) \to S(s) + 2H^+(aq) + 2Cl^-(aq)$
The rate equation for this reaction is rate $= k[Cl_2][H_2S]$ Which of these mechanisms is/are consistent with this rate equation ?
$A.\,C{l_2} + {H_2}S \to {H^ + } + C{l^ - } + C{l^ + } + H{S^- }$ (slow)
$C{l^ + } + H{S^ - } \to {H^ + } + C{l^ - } + {S}$ (fast)
$B.\, H_2S \Leftrightarrow H^+ + HS^-$ (fast equilibrium)
$Cl_2 + HS^-\to 2Cl^-+ H^+ + S$ (slow)