搜题请搜索小程序“爱下问搜题”
问题 选择题

氢化铵（NH4H）与氯化铵的结构相似，又知NH4H与水反应有H2生成，下列叙述正确的是 [ ]

A．NH4H是共价化合物

B．NH4H溶于水，所形成的溶液显碱性

C．NH4H与水反应时，水被氧化

D．NH4H中的H元素均为+1价

答案

答案：B

补全对话，情景问答

根据语境，用恰当的语言完成对话。

A: Hello, Mrs. Wang.

B: Hi, Jenny.

A: Would you like to have a cup of Coffee with me?

B: 1_______, but I have to stay at home with my daughter.

A: 2_______?

B: Just because she is busy studying for the entrance examination these days.

A: But 3_______?

B: Nothing much. Just make her feel that I'm around when she needs me.

A: What a good mother! I wonder 4_______.

B: It will begin this Wednesday. There are only two days left.

A: Really? Take it easy, Mrs Wang. Wish your daughter good luck!

B: 5_______.

查看答案
单项选择题

采用沉淀滴定法测定MgO，沉淀形式为Mg2NH4PO4，称量形式为Mg2P2O7，则换算因数为( )。

A．MgO/2Mg2P2O7

B．2MgO/Mg2P2O7

C．2MgO/Mg2NH4PO4

D．2mg2P2O7/MgO

E．Mg2P2O7/2mgO
查看答案