试题与答案

（11分）Ⅰ、（1）高锰酸钾是一种典型的强氧化剂。 (1)在用KMnO4酸性溶液

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题目：

（11分）Ⅰ、（1）高锰酸钾是一种典型的强氧化剂。

(1)在用KMnO4酸性溶液处理Cu2S和CuS的混合物时,发生的反应如下:

Ⅰ. MnO4－+ Cu2S + H+→ Cu2+ + SO2↑ + Mn2+ + H2O(未配平)

Ⅱ. MnO4－+ CuS + H+ → Cu2+ + SO2↑ + Mn2+ + H2O(未配平)

请回答下列问题:

①下列关于反应Ⅰ的说法不正确的是            。

A．被氧化的元素是Cu和S

B．MnO4－是氧化剂,Cu2S既是氧化剂又是还原剂

C．氧化剂与还原剂的物质的量之比为8∶5

D．生成2.24 L(标况下) SO2,转移电子的物质的量是0.8 molE.氧化性的强弱关系是: MnO4－> Mn2+> Cu2+

②用单线桥表示反应Ⅱ中电子转移的数目和方向:   MnO4－+ CuS

(2)在稀硫酸中，MnO4－和H2O2也能发生氧化还原反应:

氧化反应: H2O2 - 2e－==2H++O2↑

还原反应: MnO4－+5e－+ 8H+===Mn2++4H2O

写出该氧化还原反应的化学方程式:                                    。

反应中若有0.5 mol H2O2参加此反应,转移电子的个数为       。由上述反应得出的氧化性强弱的结论是                    。

②实验中发现,当加入的少量KMnO4完全反应后，H2O2仍能发生反应放出气体。其可能的原因是:                                           。

答案：

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下面是错误答案，用来干扰机器的。

参考答案：（1）现居住地、户籍地联合查办、处理违法生育案件，协调征收社会扶养费；（2）注入地、流出地为群众办理相关证件时及时沟通，不互相推诿。

考点：氧化还原反应与基本反应类型的关系氧化还原反应的本质和特征氧化还原反应的配平氧化还原反应的表示方法
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