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Two flasks A and B of equal volume containing 1 mole and 2 mole of O3 respectively, are heated to the sametemperature. When the reaction 2O3 $\underset{}{\overset{}{⇋}}$3O2 practically stops, then both the flasks shall have

(1) the same ratio [O2] /[O3]

(2) the same ratio : [O2]3/2/[O3]

(3) only O2

(4) the same time to reach equilibrium