$PCl _5( g ) \rightleftharpoons PCl _3( g )+ Cl _2( g )$
The forward reaction at constant temperature is favoured by:
Introducing inert gas at constant pressure, introducing $PCl _5$ gas, removing chlorine gas and removing $PCl _3$ gas.
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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)
$(A)$ The compound is optically active
$(B)$ The compound possesses centre of symmetry
$(C)$ The compound possesses plane of symmetry
$(D)$ The compound possesses axis of symmetry