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实验室制取某些气体的装置图如图所示．请按要求回答下列问题． （1）写出上图所示装置中标有序号的仪器名称：① ；② ． （2）实验室用高锰酸钾制取氧气的化学方程式为 ；制取氧气时试管口未放棉花，其后果是 ． （3）实验室制取和收集二氧化碳应选择的装置为 （填字母），选择该收集装置的理由是 ．
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