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Why does the dissociation of PCl(5) decr...

Why does the dissociation of `PCl_(5)` decreases in the presence of `Cl_(2)` ?

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The reaction can be written as `PCl_(5) hArr PCl_(3) + Cl_(2)`
If we increase the concentration of `Cl_(2)`, for example, product in the above reaction then the equilibrium will shift towards the reactant side (Le-Chatelier.s principle). The equilibrium will shift towards the backward direction. So, dissociation of `PCl_(5)` decreases.
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