[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fAtS00xYnEhQ21OJ2ygSaT9UF6vD_qn7nTJlKIy_W9XY":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":31,"type":32},[],"2024-05-16 12:11:13",143952305,[8,9,10,11],"未加入乙醚,因 CrO5 与乙醚的加合物为蓝色","未加入戊醇,因 CrO5 萃取到戊醇中显蓝色","未将溶液调至碱性,因 CrO5 在酸性介质中分解","因 K2Cr2O7 (和\u002F或) H2O2 浓度过稀",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},87,"3ee771ebdf5a97e6f0ab4dbb47eebce8","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fdb3a5eb6177bf85ad556cb52c242afa2.jpg","药学院“知行杯”系列竞赛","a43e317dd34442e1826bc0d94a2bda47","初赛练习题库1","向酸性 K2Cr2O7 溶液中加入 H2O2 ,却未观察到蓝色物质生成,其原因肯定是",[21,33,36,45,54,63,72,81,90,99],{"answer":22,"createTime":23,"id":24,"options":25,"question":30,"source":31,"type":32},[],"2025-05-09 16:15:37",143952304,[26,27,28,29],"PbCrO4","Ag2CrO4","BaCrO4","CaCrO4","下列化合物,在 NaOH 溶液中溶解度最大的是-","v1",0,{"answer":34,"createTime":5,"id":6,"options":35,"question":19,"source":31,"type":32},[],[8,9,10,11],{"answer":37,"createTime":5,"id":38,"options":39,"question":44,"source":31,"type":32},[],143952306,[40,41,42,43],"向饱和 K2Cr2O7 溶液中加入浓硫酸","将 K2Cr2O7 溶于热的浓硫酸","将 K2Cr2O7 溶于 1 ∶ 1 硫酸","将 K2Cr2O7 与浓硫酸共热","实验室配制洗液,最好的方法是",{"answer":46,"createTime":5,"id":47,"options":48,"question":53,"source":31,"type":32},[],143952307,[49,50,51,52],"Na3PO4","Na2HPO4","NaH2PO4","以上三种溶液均可","滴加 0.1mol·L-1 CaCl2 溶液没有沉淀生成,再滴加氨水有白色沉淀生成,该溶液是",{"answer":55,"createTime":5,"id":56,"options":57,"question":62,"source":31,"type":32},[],143952308,[58,59,60,61],"将试管倾斜,滴管口贴在试管壁,再缓慢滴入试剂","将试管倾斜,滴管口距试管口约半厘米处缓慢滴入试剂","将试管垂直,滴管口伸入试管内半厘米再缓慢滴入试剂","将试管垂直,滴管口贴在试管壁,再缓慢滴入试剂","从滴瓶中取少量试剂加入试管的正确操作是",{"answer":64,"createTime":5,"id":65,"options":66,"question":71,"source":31,"type":32},[],143952309,[67,68,69,70],"高锰酸钾晶体与盐酸反应制氯气","块状二氧化锰与浓盐酸反应制氯气","无水碳酸钾与盐酸反应制二氧化碳","块状硫化亚铁与稀硫酸反应制备硫化氢","制备下列气体时可以使用启普发生器的是",{"answer":73,"createTime":5,"id":74,"options":75,"question":80,"source":31,"type":32},[],143952310,[76,77,78,79],"饱和氯化钠和浓硫酸","浓硫酸和饱和氯化钠","氢氧化钙固体和浓硫酸","饱和氯化钠和氢氧化钙固体","实验室用浓盐酸与二氧化锰反应制备氯气, 欲使氯气纯化则应依次通过",{"answer":82,"createTime":5,"id":83,"options":84,"question":89,"source":31,"type":32},[],143952311,[85,86,87,88],"①②③④⑤","②①③④⑤","②③①④⑤","③②①④⑤","使用煤气灯涉及的操作有: ①打开煤气灯开关;②关闭空气入口;③擦燃火柴;④点燃煤气灯;⑤调节煤气 灯火焰.点燃煤气灯时操作顺序正确的是",{"answer":91,"createTime":5,"id":92,"options":93,"question":98,"source":31,"type":32},[],143952312,[94,95,96,97],"NaOH","NH3 ·H2O","Na2CO3","NaHCO3","能将 Cr3+ 和 Zn2+ 离子分离的溶液是",{"answer":100,"createTime":5,"id":101,"options":102,"question":107,"source":31,"type":32},[],143952313,[103,104,105,106],"SnCl2 溶液:将 SnCl2 溶于稀盐酸后加入锡粒","FeSO4 溶液:将 FeSO4 溶于稀硫酸后放入铁钉","Hg(NO3)2 溶液:将 Hg(NO3)2 溶于稀硝酸后加入少量 Hg","FeCl3 溶液:将 FeCl3 溶于稀盐酸","下列配制溶液的方法中, 不正确的是"]