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现有下列物质 : 1 水银 ; 2 氧化镁 ; 3 液态氧 ; 4 自来水 ; 5 冰、水混合物 ; 6 高锰酸钾 ( KMnO 4 ) 。其中属于混合物的是 , 属于单质的是 , 属于化合物的是 , 属于氧化物的是 。 (填数字, 一个空有多个答案时请用分号“;”隔开 )
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