PCl5(g) --- PCl3(g) + Cl2(g) At equilibrium if the presure of system is decreased then select which of the following is not

Question

PCl5(g) ---> PCl3(g) + Cl2(g)
At equilibrium if the presure of system is decreased then select which of the following is not correct.
Concentration of all decreases.
Degree of dissociation of PCl5 increases.
Vapour density of mixture decreases.
Vapour density of mixture increases.

Kunduz · Accepted Answer

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PCl5(g) ---> PCl3(g) + Cl2(g) At equilibrium if the presure