["일일 문제_이론적 기초2", "727.17.113.16\n", "A..NH3\n", "B.........A..A.A.AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA 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Thread Content
选择题：下列物质中，熔点由低到高排列的顺序应该是： A.NH3
B，学*了，本以为二氧化硅熔点最高，原来是氧化钙
答案错了吧，熔点：PH3（-132.8℃）
DSiO2为原子晶体，CaO为离子晶体，NH3、PH3为分子晶体，通常原子晶体熔点最高，离子晶体次之，分子晶体最低，而NH3分子之间由于氢键的存在，熔点比PH3高。
D 解析] SiO2为原子晶体，CaO为离子晶体，NH3、PH3为分子晶体，通常原子晶体熔点最高，离子晶体次之，分子晶体最低，而NH3分子之间由于氢键的存在，熔点比PH3高。