The degree of dissociation $(\alpha )$ of $PCl_5$ obeying the equilibrium;  is $PC{l_5}\, \rightleftharpoons \,PC{l_3}\, + \,C{l_2}$ related to the pressure at equlibrium by

  • A

    $\alpha \, \propto \,P$

  • B

    $\alpha \, \propto \,\frac{1}{{\sqrt P }}$

  • C

    $\alpha \, \propto \,\frac{1}{{{P^2}}}$

  • D

    $\alpha \, \propto \,\frac{1}{{{P^4}}}$

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