Phosphorus pentachloride dissociates as follows, in a closed reaction vessel, \[ \mathrm{PCl}_{5...

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Phosphorus pentachloride dissociates as follows, in a closed reaction vessel,
\[
\mathrm{PCl}_{5}(\mathrm{~g}) \rightleftharpoons \mathrm{PCl}_{3}(\mathrm{~g})+\mathrm{Cl}_{2}(\mathrm{~g})
\]
If total pressure at equilibrium of the reaction mixture is \( \mathrm{P} \) and degree of dissociation of \( \mathrm{PCl}_{5} \) is \( \mathrm{x} \), the partial pressure of \( \mathrm{PCl}_{3} \) will be-
(A) \( \left(\frac{2 \mathrm{x}}{1-\mathrm{x}}\right) \mathrm{P} \)
(B) \( \left(\frac{x}{x-1}\right) P \)
(C) \( \left(\frac{\mathrm{x}}{1-\mathrm{x}}\right) \mathrm{P} \)
(D) \( \left(\frac{x}{x+1}\right) P \)
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