问题 选择题

在Fe和Cu混合物中,加入一定量的AgNO3溶液,充分反应后过滤,以下说法错误的是(  )

A.滤液中一定有Fe(NO32

B.只要加入AgNO3溶液,就一定会有Cu(NO32生成

C.只要加入AgNO3溶液就一定会有Ag生成

D.在滤液中滴加盐酸,有白色沉淀,在固体中加入盐酸一定没有H2产生

答案

由金属活动性表的顺序可知,铁、铜、银的活泼性顺序为:铁>铜>银.在Fe和Cu混合物中,加入一定量的AgNO3溶液,首先铁与硝酸银反应,待铁完全反应后,铜和硝酸银进行反应.由以上分析可知:

A、由于铁与硝酸银反应,滤液中一定有Fe(NO32.故A正确;

B、只要加入AgNO3溶液,就一定会有Fe(NO32生成.故B错误;

C、只要加入AgNO3溶液就一定会有Ag生成.故C正确;

D、在滤液中滴加盐酸,有白色沉淀,说明了有硝酸银剩余,铁是不足量的,过滤的固体中没有铁.在固体中加入盐酸一定没有H2产生.故D正确.

故选B.

阅读理解
根据短文内容,判断正(T)误(F)。
Dear Jane,
     After I left Paris I spent two days in New York. I got to Miami on Nov.13rd. The weather
is wonderful here. This morning, I met Jennifer Lopez--my favorite movie star. I asked her to
take a picture with me. You know, that was my dream. She agreed! I'm going to show you!
                                                                                                                                         John

Dear Dad,
      I got here at last after 18 hours on a train! It's very cold here in Moscow. It's white everywhere.
This afternoon I went to have a look at the city. I got lost. I'm glad I took Russian lessons in my
university. They helped me a lot. I think I can finish my work here and go back home soon.
     I miss the warm sunshine at home. See you soon.
                                                                                                                                        Max

Dear Amy,
     I arrived in Guilin yesterday. What a beautiful place! The people here are kind and I have some
new friends. Guess who I met here! Tom, my high school classmate. He showed me around the city.
I bought a special bag made in Guilin for you and a silk table cloth for mom. Tomorrow evening I'm
going to fly to Beijing.
                                                                                                                                  Love,
                                                                                                                                  Maria
(     )1. Maria had a good time in Guilin.
(     )2. Maria went to see her classmate in Guilin.
(     )3. It was warm in Max's hometown, but it was cold in Moscow.
(     )4. John was very glad that his dream of going to Paris came true. 
(     )5. Max speaks a little Russian.
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