下列关于氯水的叙述正确的是( )     A.新制氯水可使蓝色石蕊

下列关于氯水的叙述正确的是(  )

    A.新制氯水可使蓝色石蕊试纸先变红后褪色 B.光照氯水有气泡放出,该气体是Cl2

    C.新制氯水中只含Cl2H2O分子          D.氯水放置数天后酸性将变弱

答案

A

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