摘要:16.下表列出了在标准大气压下三种气体的沸点.今设法把空气液化逐渐提高温度.利用沸点的不同分理出不同的气体.那么先后得到的气体的顺序是 A.氧.氮.氢 B.氢.氮.氧 C.氧.氢.氦 D.氢.氧.氮物质氧氮氢沸点(℃)一l83―196―253

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下表中列出了一些物质的熔点和沸点(1标准大气圧下),根据表中数据回答下列问题:
物质
熔点(℃)
沸点(℃)

0
100

80
210
水银
-39
357
酒精
-117
78

-210
-196

-268
-183
(1)表中所列物质在常温下属于固态的是________;氧在-145℃时所处的状态是______
(2)要探究萘的熔化和沸腾过程中温度的变化,应选_______作温度计的测量物质。
(3)如果在1标准大气压下用降温的办法从空气中提取氧和氮,那么温度下降时首先液化被分离出来的是                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  (4)1标准大气圧下,当温度为0℃时,水的状态(  )
A.一定是固态            B.一定是液态      
C.一定是固液共存态       D.以上三种状态都有可能
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