JEE Advanced 2020 Concept Recapitulation Test 4 Paper 2

An equilibrium PCl5∕0∣⇌PCl3(a)+Cl2∕g) is obtained by starting with 1mole of PCl5 in a 1L vessel. A vapour density of equilibrium mixture was found to be 250.2. Now, the equilibrium mixture is transferred into a vessel of 2L capacity, its new degree of dissociation is.