[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fpJ5MwgV8NJcpx9Qm_rEe10ht0gyEfC1_F8F97PnOY_0":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":30,"type":31},[],"2025-12-06 18:20:32",252819292,[8,9,10,11],"A","B","D","C",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},68,"53e1d2ef4961cca8eea3e23969ad2cb9","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F03a579384a6dc297c89809b582fcc767.png","默认课程","exam_168623394","分析化学","若BaCl2中含有NaCl、KCl、CaCl2等杂质,用H2SO4沉淀Ba2+时,生成的BaSO4最易吸附何种离子. (A)Na+;(B)K+;(C)Ca2+;(D)H+",[21,32,41,50,55,60,65,68,77,82],{"answer":22,"createTime":5,"id":23,"options":24,"question":29,"source":30,"type":31},[],252819286,[25,26,27,28],"分光光度法","沉淀滴定法","氧化还原滴定法","络合滴定","某矿石中镉含量在0.1 % 以下,要求测定结果相对误差为2 %左右,选用下述何种方法较为适宜","v1",0,{"answer":33,"createTime":5,"id":34,"options":35,"question":40,"source":30,"type":31},[],252819287,[36,37,38,39],"试剂失水","试剂不纯","试剂吸水","试剂吸收杂质","用HCl标准溶液测定硼砂(Na2BO7•10H2O)试剂的纯度,有时会出现含量超过100%的情况,其原因是()",{"answer":42,"createTime":5,"id":43,"options":44,"question":49,"source":30,"type":31},[],252819288,[45,46,47,48],"EӨ' = EӨ - 0.047 pH","EӨ' = EӨ - 0.47 pH","EӨ' = EӨ - 0.12 pH","EӨ' = EӨ - 0.094 pH","MnO4-\u002FMn2+ 电对的条件电势与 pH 关系是",{"answer":51,"createTime":5,"id":52,"options":53,"question":54,"source":30,"type":31},[],252819289,[9,10,11,8],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Ffc7bfecc7bafb6d5b025a7897d79c331.webp\">",{"answer":56,"createTime":5,"id":57,"options":58,"question":59,"source":30,"type":31},[],252819290,[11,9,8,10],"某显色络合物,测得其吸光度为A1,经第一次稀释后,测得其吸光度A2,再稀释一次,测得其吸光度A3.已知A1-A2=0.500,A2-A3=0.250.其透光率比值T3:T1应为:(A)1.78;(B)5.16;(C)3.16;(D)5.62",{"answer":61,"createTime":5,"id":62,"options":63,"question":64,"source":30,"type":31},[],252819291,[8,10,11,9],"可用于直接配制标准溶液的是( ) (A)高锰酸钾;(B)重铬酸钾;(C)Na2S2O3;(D)NaOH",{"answer":66,"createTime":5,"id":6,"options":67,"question":19,"source":30,"type":31},[],[8,9,10,11],{"answer":69,"createTime":5,"id":70,"options":71,"question":76,"source":30,"type":31},[],252819293,[72,73,74,75],"4.0×105L﹒mol-1﹒cm-1","4.0×10-3L﹒mol-1﹒cm-1","4.0×103L﹒mol-1﹒cm-1","4.0×10-4L﹒mol-1﹒cm-1","某金属离子M与试剂R形成一有色络合物MR,若溶液中M的浓度为1.0×10-4mol﹒L-1,用25px吸收池于波长525nm处测得吸光度A为0.400,此络合物在525nm处的摩尔吸光系数为 ( )",{"answer":78,"createTime":5,"id":79,"options":80,"question":81,"source":30,"type":31},[],252819294,[8,10,11,9],"于pH=6.0时,在0.020 mol\u002FL EDTA溶液滴定50.00mL 0.020mol\u002FL Cu2+溶液.当加入100.0mL EDTA溶液时,在下列叙述中,哪一个是正确的(A)lg[Cu2+]=lgK'CuY;(B)pCu=lgK'CuY;(C)pCu=-lgK'CuY;(D)pCu=pK'CuY",{"answer":83,"createTime":5,"id":84,"options":85,"question":90,"source":30,"type":31},[],252819295,[86,87,88,89],"AgCl沉淀易胶溶","AgCl吸附Cl-增强","AgCl沉淀不完全","AgCrO4沉淀不易形成","莫尔法测定Cl-含量时,要求介质的pH值在6.5~10范围内,若酸度过高则"]