Statement - I : Bleaching powder reacts with dilute acids to evolve chlorine
Statement - II : The chlorine liberated by the action of dilute acids on bleaching powder is called available chlorine

The reaction involved is CaOCl₂ + H₂SO₄ $\underset{ }{\to }$CaSO₄ + H₂O + Cl₂  The available chlorine may be defined as the 1% of chlorine liberated when one mole of bleaching powder (127 g) is treated with excess of dilute H₂SO₄.