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At a given temperature the Kc for the reaction,

PCl5 (g PCl3 (g) + Cl2 (g) is 2.4 x10-3. At the same temperature, the Kc for the reaction

PCl3 (g) + Cl2 (g PCl5 (g)  is :

(a) 2.4x10-3            (b) -2.4 x10-3

(c) 4.2 x10           (d)  4.8 x10-2