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\( \mathrm{PCI}_{5} \) dissociation a closed container as :
\[
\mathrm{PCl}_{5}(\mathrm{~g}) \rightleftharpoons \mathrm{PCl}_{3}(\mathrm{~g})+\mathrm{Cl}_{2}(\mathrm{~g})
\]
\( P \)
If total pressure at equilibrium of the reaction mixture is \( \mathrm{P} \) and degree of dissociation of \( \mathrm{PCl}_{5} \) is \( \alpha \), the partial pressure of \( \mathrm{PCl}_{3} \) will be :
W
(A) \( P \cdot\left[\frac{\alpha}{\alpha+1}\right] \)
(B) \( P \cdot\left[\frac{2 \alpha}{1-\alpha}\right] \)
(C) P \( \left[\frac{\alpha}{\alpha-1}\right] \)
(D) \( P \cdot\left[\frac{\alpha}{1-\alpha}\right] \)
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