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【单选题】
如图是 “空气中氧气体积分数测定”实验的改进装置,主要操作是:在实际容积为 150mL 的集气瓶里,先装进 50mL 的水,再按图连接好仪器,按下热的玻璃棒,白磷立即被点燃。(提示:白磷与红磷的化学性质相似,在 40 °C就能够燃烧生成五氧化二磷)。下列说法正确的是( ) 1该实验中白磷燃烧产生大量的白色烟雾; 2整个实验过程中集气瓶内水面的现象是先下降后上升; 3若集气瓶中无水,则导致实验最后产生的实际值偏小; 4最终集气瓶中液面上升了 70mL ; 5该实验还可得出剩余气体不可燃也不支持燃烧 。
A.
③④
B.
②⑤
C.
①③⑤
D.
②④
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were they the same men
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