问题 填空题

为了回收利用SO2,研究人员研制了利用低品位软锰矿浆(主要成分是MnO2)吸收高温焙烧含硫废渣产生的SO2废气,制备硫酸锰晶体的生产流程,其流程示意图如下:

已知,浸出液的pH<2,其中的金属离子主要是Mn2+,还含有少量的Fe2+、Al3+等其他金属离子。有关金属离子形成氢氧化物沉淀时的pH见下表

请回答下列问题:

(1)写出浸出过程中主要反应的化学方程式:_________________

(2)写出氧化过程中主要反应的离子方程式:___________________

(3)在氧化后的液体中加入石灰浆,并用pH试纸测定调节pH,pH应调节范围是_______________。

(4)滤渣的主要成分有_____________

(5)下列各组试剂中,能准确测定尾气中SO2含量的是___________。(填编号)

a.NaOH溶液、酚酞试液 b.稀H2SO4酸化的KMnO4溶液 c.碘水、淀粉溶液 d.氨水、酚酞试液

答案

(1)SO2+MnO2=MnSO4

(2)2Fe2++MnO2+4H+=2Fe3++Mn2++2H2O

(3)5~8

(4)氢氧化铁、氢氧化铝、硫酸钙

(5)bc

阅读理解

阅读短文回答问题。

     What do 17-year-old boys usually do ? Play computer games, read books or play basketball? But to

Zac , all interests in   his  life are from the sea. He is a 17-year-old  US  sailor.   After  a   hard 13-month

voyage, he and his 11-metre sailboat arrived at a Southern California harbour. He becomes the youngest

person to sail around the world alone.  

     When Zac was just a child, he had a dream-driving his own boat to travel around the world . so he

saved all his pocket money . When he was 16 years old, he had 6,500 dollars. He bought a sailboat, and

started his journey with the support of his father, a ship builder.

     On June 14, 2008, Zac left Marin Del Rey, south of Los Angeles, and celebrated his 17th birthday at

sea near Africa's Cape of Good Hope.

     During his 28,000-mile journey , he came over many difficulties. When he came back home , he was

welcomed by a lot of people. It is said fewer than  250 People  have sailed around the world alone. The

number of reaching the top of Mount Everest is three  times as large  as the number of sailing around the

world alone.  

参考词汇:voyage航海    harbour 港湾    sail 航行  Mount Everest珠穆朗玛峰  

Cape of Good Hope 好望角

1.Where are Zac's interests from?

______________________________________________________________________

2.How long did he spend in traveling around the world?

______________________________________________________________________

3.What was his father's job?

______________________________________________________________________

4. Was his journey difficult?

______________________________________________________________________

5. Which number is smaller ,the number of reaching the top of Mount Everest or the number of sailing

around the world alone?

______________________________________________________________________

单项选择题 案例分析题