11.非水滴定中，加入醋酸汞试液的作用是(      )

A.指示剂                                                     B.消除氢卤酸的干扰

C.提供汞离子                                              D.滴定剂

12.下列能与氢氧化钠试液加热逸出二乙胺臭味，使湿润的石蕊试纸变蓝的是(      )

A.尼可刹米                                                 B.阿司匹林

C.尼群地平                                                 D.硝苯地平

13.下列哪个反应不是异烟肼的鉴别反应。(      )

A.二硝基氯苯反应                                       B.Vitaili反应

C.银镜反应                                                 D.戊烯二醛反应

14.硝苯地平与硫酸铈反应的化学计量摩尔比为(      )

A.1∶1                                                        B.1∶2

C.2∶3                                                        D.3∶2

15.下列哪种维生素可以和铁氰化钾反应生成硫色素的是(      )

A.维生素A                                                  B.维生素B

C.维生素C                                                  D.维生素E