题目内容

【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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