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（5分）洪灾过后，饮用水的消毒杀菌成为抑制大规模传染性疾病爆发的有效方法之一。漂白粉是常用的消毒剂。 （1）工业上将氯气通入石灰乳[Ca(OH) 2 ]制取漂白粉，化学反应方程式为 ； （2）漂白粉的有效成分是（填化学式） ； （3）漂白粉溶于水后，受空气中的CO 2 作用，即产生有漂白、杀菌作用的次氯酸，化学反应方程式为 ；
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