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问题 选择题

在化学分析实验中，常常用到酸碱滴定、沉淀滴定、氧化还原滴定等。下列属于氧化还原滴定的是（　　）

A．用标准盐酸滴定NaOH溶液

B．用标准KMnO4溶液滴定FeSO4溶液

C．用标准KSCN溶液滴定FeCl3溶液

D．用标准AgNO3溶液滴定NaCl溶液

答案

答案：B

A项属于酸碱中和滴定；B项属于氧化还原滴定；C项中SCN－与Fe3＋发生络合反应，生成血红色溶液，滴定过程中没有发生氧化还原反应；D项属于沉淀滴定。

改错题

短文改错。

Christine was just a girl in one of my classes.I never knew much about

her except for that she was strange.She didn't talk  many.Her hair was black

and purple, and she worn black sports shoes and a black sweater, although in the

 summer.She was, in fact, rather attractively, and she never seemed care what

the rest of us thought about her. Like the rest of my classmate, I didn't really

want to get closed to her.It was only when we did their chemistry project

together that  I begin  to  understand why Christine dressed the way  she  did.

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单项选择题

胰腺A1 G细胞分泌

A．老年人
B．青壮年
C．2岁以内小儿
D．3岁以上儿童
E．新生儿
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