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【题目】实验室制备氨气,检验是否收集满的正确方法是(

A.用手扇动收集的气体,有气味则已收集满

B.将润湿的淀粉KI试纸接近瓶口,试纸变蓝则已收集满

C.将润湿的红色石蕊试纸伸入瓶内,试纸变蓝则已收集满

D.用玻璃棒一端蘸取浓盐酸,接近瓶口,产生大量白烟,证明已收集满

【答案】D

【解析】氨气极易挥发,闻到有气味的气体不一定表明已收集满,故A错误;氨气没有强氧化性,不能使淀粉KI试纸变蓝,故B错误;红色石蕊试纸应放于试剂瓶口进行检验,伸入瓶内操作错误,故C错误;NH3和HCl反应生成NH4Cl产生白烟,化学方程式为:NH3+HCl=NH4Cl,用玻璃棒一端蘸取浓盐酸,接近瓶口,产生大量白烟能证明已收集满,故D正确;

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