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$\left[\mathrm{PtCl}_{4}\right]^{2-}+\mathrm{H}_{2} \mathrm{O} \rightleftharpoons\left[\mathrm{Pt}\left(\mathrm{H}_{2} \mathrm{O}\right) \mathrm{Cl}_{3}\right]^{-}+\mathrm{Cl}^{-}$
was measured as a function of concentrations of different species. It was observed that
$\frac{-\mathrm{d}\left[\left[\mathrm{PtCl}_{4}\right]^{2-}\right]}{\mathrm{dt}}=4.8 \times 10^{-5}\left[\left[\mathrm{PtCl}_{4}\right]^{2-}\right]-2.4 \times10^{-3}\left[\left[\mathrm{Pt}\left(\mathrm{H}_{2} \mathrm{O}\right) \mathrm{Cl}_{3}\right]^{-}\right]\left[\mathrm{Cl}^{-}\right]$
where square brackets are used to denote molar concentrations. The equilibrium constant $\mathrm{K}_{\mathrm{c}}=....$. (Nearest integer)
$(a)\,\,{N_2}(g) + {O_2}(g) \rightleftharpoons \,\,2NO(g); $ $\Delta {H^o}\, = \,181\,\,kJ$
$(b)\,\,2C{O_2}(g)\,\,\,\, \rightleftharpoons \,2CO(g)\, + \,{O_2}(g);$ $\Delta {H^o}\, = \,566\,\,kJ$
$(c)\,\,{H_2}(g) + {I_2}(g) \rightleftharpoons \,2HI(g) ;$ $\Delta {H^o}\, = \,-9.4\,\,kJ$
$(d)\,\,{H_2}(g) + {F_2}(g) \rightleftharpoons \,2HF(g) ;$ $\Delta {H^o}\, = \,-541\,\,kJ$