The incorrect statement about ozone is

Pure ozone is pale blue gas, dark blue liquid and violet black solid

$3O_{2\left(g\right)}\to 2O_{3\left(g\right)}\mathrm{\Delta }{H}_f^0=-142\mathrm{kJ}/\text{mole}$

ozone reacts with an excess of potassium iodide solution buffered with a borate buffer (pH 9.2),
iodine is liberated

Ozone is thermodynamically unstable with respect to oxygen.