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【题目】下列关于NH3性质的说法正确的是( )

A.收集时采用向上排空气法 B.能使湿润的红色石蕊试纸变蓝

C.可用浓硫酸进行干燥 D.不能与氧气反应

【答案】B

【解析】氨气密度比空气小,所以收集时采用向下排空气法,A项错误;氨气溶于水生成一水合氨,电离出氢氧根离子,所以氨气能使湿润的红色石蕊试纸变蓝,B项正确;氨气是碱性气体,与硫酸反应,氨气只能用碱性和中性干燥剂干燥,C项错误;D、氨气与氧气在点燃的条件下生成氮气和水,D项错误;答案选B。

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