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【简答题】
高锰酸钾（KMnO 4 ）是实验室中常用制取氧气的物质． （1）在物质分类中，高锰酸钾是否属于氧化物______（填“是”或“否”）． （2）高锰酸钾对皮肤和衣服有很强的腐蚀性，这种性质属于它的______性质（填“物理性质”或“化学性质”）． （3）在15.8g高锰酸钾中含氧元素______g． （4）______ g过氧化氢（H 2 O 2 ）与15.8g高锰酸钾中所含氧元素质量相等． （5）如图是实验室用高锰酸钾制取氧气的装置图，试回答以下问题： ①写出标号所示仪器的名称． b．______ ②若某同学在实验过程中发现导气管堵塞，水槽里的水变红，原因可能是：______． ③若加热了很长时间一直没有气泡冒出，原因可能是：______． ④若用该装置收集的氧气不纯净，混有空气，原因可能是：______． ⑤若实验结束时，发生水槽里水倒流到试管里，使试管炸裂，原因可能是：______． ⑥加热高锰酸钾制取氧气的化学反应式为：______（用化学式表示）．
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