化学反应中，有时存在“一种物质过量，另一种物质仍不能完全反应_爱下问搜题

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问题选择题

化学反应中，有时存在“一种物质过量，另一种物质仍不能完全反应”的特殊情况。下列反应中属于这种情况的是 ①过量的锌与18 mol·L^－¹的硫酸反应；②过量的氢气与少量氮气在催化剂存在下充分反应；③浓盐酸与过量的MnO₂反应；④过量铜与浓硫酸反应；⑤过量稀硝酸与银反应；⑥过量稀硫酸与块状石灰石反应

A．②③④⑥

B．②③⑤

C．①④⑤

D．①②③④⑤⑥

答案

答案：A

①Zn＋2H₂SO₄(浓)ZnSO₄＋SO₂↑＋2H₂O、Zn＋H₂SO₄(稀)=ZnSO₄＋H₂↑。

②N₂和H₂的反应为可逆反应。③当浓盐酸变稀后，反应停止。④Cu不和稀硫酸反应。⑤Ag和稀HNO₃完全反应。⑥生成的CaSO₄微溶，阻止反应进一步进行。

阅读理解

Minzu Hotel Beijing

Address:51 Fuxingmennei Avenue, Xicheng District, Beijing

On the West Chang An Street, Minzu Hotel Beijing is next to the Xidan Business Center. 2km to Tiananmen Square, 5.5km to Beijing Railway Station, 30km to Beijing International Airport.
Starting in 2005, the hotel is now with both western and Chinese style best services. It is a best home for visitors to Beijing. It has 507 modern new rooms, the restaurants there can serve different styles(风格) of food and it has many good meeting halls.
Today’s Low Price: RMB 528 for a standard(标准的) room.
You can pay with

If you want to book a room, please call:010-66668188

小题1:Where is the hotel?

B．In Beijing.

C．Near a restaurant.

D．Between the railway station and the airport.

小题2:The hotel is the nearest to ________.

A．Tian’anmen Square

B．Beijing Railway Station

C．Xidan Business Center

D．Beijing International Airport

小题3:Why is it a best home for visitors?

A．It is near a shopping center.

B．It is not so expensive.

C．It is easy to go out from.

D．All the above.

单项选择题

当证券公司选择我行作为主办存管银行时，该证券公司在我行可以开立（）个自有资金账户。

A.1

B.2

C.3

D.5