下列物质中,熔点由低到高排列的顺序应该是( )。A. NH332332 C. NH332 D. NH332

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问题 下列物质中,熔点由低到高排列的顺序应该是( )。
选项 A. NH332332 C. NH332 D. NH332
答案 B
解析 提示:离子晶体、原子晶体、分子晶体及金属晶体中原子晶体熔点最高,离子晶体次之,分子晶体最低,SiO2为原子晶体,CaO为离子晶体,NH3、PH3 为分子晶体,而NH3分子之间由于氢键的存在,熔点比PH3高。

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