【題目】實(shí)驗(yàn)室制備氨氣,檢驗(yàn)是否收集滿的正確方法是(

A.用手扇動(dòng)收集的氣體,有氣味則已收集滿

B.將潤(rùn)濕的淀粉KI試紙接近瓶口,試紙變藍(lán)則已收集滿

C.將潤(rùn)濕的紅色石蕊試紙伸入瓶?jī)?nèi),試紙變藍(lán)則已收集滿

D.用玻璃棒一端蘸取濃鹽酸,接近瓶口,產(chǎn)生大量白煙,證明已收集滿

【答案】D

【解析】氨氣極易揮發(fā),聞到有氣味的氣體不一定表明已收集滿,故A錯(cuò)誤;氨氣沒有強(qiáng)氧化性,不能使淀粉KI試紙變藍(lán),故B錯(cuò)誤;紅色石蕊試紙應(yīng)放于試劑瓶口進(jìn)行檢驗(yàn),伸入瓶?jī)?nèi)操作錯(cuò)誤,故C錯(cuò)誤;NH3和HCl反應(yīng)生成NH4Cl產(chǎn)生白煙,化學(xué)方程式為:NH3+HCl=NH4Cl,用玻璃棒一端蘸取濃鹽酸,接近瓶口,產(chǎn)生大量白煙能證明已收集滿,故D正確;

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