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问题 选择题

将0.2molMnO2和含0.6molHCl的浓盐酸混合后加热，反应完全后向留下的溶液中加入足量AgNO3溶液，生成AgCl沉淀物质的量为(不考虑盐酸的挥发) （  ）     

A．等于0.3mol

B．小于0.3mol

C．大于0.3mol，小于0.6mol

D．等于0.6mol

答案

答案：C

用极端假设法。假设完全没有反应，生成0.6mol；假设全部发生反应，生成MnCl2，0.15mol，故生成AgCl0.3mol；介于二者之间，答案为C。

单项选择题

原油贮罐发生沸溢和喷溅有典型的征兆，下列不属于的是（）。

A、罐壁会发生剧烈抖动

B、烟雾增多

C、伴有强烈的噪声

D、火焰更加发亮
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单项选择题

An analyst does research about money-weighted rate of return and time-weighted rate of return. On 30 June 2010, an investor opened an account with $1000000. The account experienced the following activity over the next two years:

Date Withdrawals Net Ending Balance
30 June 2011 $471000 $451000
30 June 2012 — $499900
As of 30 June 2012, the investor's money-weighted rate of return and timeweighted rate of return:（）

A. are both positive.

B. are both negative.

C. have different signs.
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