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【单选题】
已知汞（Hg）极易蒸发为剧毒的汞蒸气。制氧气的方法有： ①2KMnO 4 K 2 MnO 4 +MnO 2 +O 2 ↑ ②2KClO 3 2KCl+3O 2 ↑ ③2HgO 2Hg+O 2 ↑ ④分离液态空气制氧气 ⑤用双氧水(H 2 O 2 ）制取O 2 (MnO 2 作催化剂）2H 2 O 2 2H 2 O+O 2 ↑ 其中适用于实验室制氧气的方法是( )A.
①②⑤
B.
②④⑤
C.
①③⑤
D.
②③⑤
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