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原电池&电极电势

Authored by Tan Yean

Chemistry

11th Grade

Used 2+ times

原电池&电极电势
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9 questions

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1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

某电池可用以下电池符号来表达:

Zn(s)/Zn2+(aq)∥Cu2+(aq)/Cu(s)

下列哪项关于此电池的叙述是错误的?

氧化作用在负极进行

锌电极是还原剂

铜将沉淀在铜电极上

电子会从锌电极释放到溶液里

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

某电池中两个半反应的标准电极电位如下所示:

铂电极A:MnO4+8H++5e→Mn2++4H2O         E=+1.51V

铂电极B:Cl2+2e→2Cl                                   E=+1.36V

下列叙述中,哪些是正确的?

Ⅰ  此电池的标准电动势是 +0.15 V

Ⅱ  外电路中电子从铂电极B流向铂电极 A

Ⅲ  电池符号是 Pt(s)∣Mn2+(aq),MnO4(aq)∥Cl(aq),Cl2(g)∣Pt(s)

Ⅰ,Ⅱ

Ⅱ,Ⅲ

Ⅰ,Ⅱ,Ⅲ

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

如果

Mg2+(aq)+2e→Mg(s)           E=−2.38V

Cu2+(aq)+2e→Cu(s)             E=+0.34V

则原电池 Mg(s)∣Mg2+(aq)∥Cu2+(aq)∣Cu(s)的标准电动势(Eº)是多少 V?

+2.72

-2.72

+2.04

+1.36

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

X、Y、Z- 按还原性强度递增的顺序,正确的排列是________

X < Y < Z-

X < Z- < Y

Z- < X < Y

Z- < Y < X

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

在标准电池反应中,电子的流动方向是怎样的?

从负极流向正极

从正极流向负极

在电解质中随机流动

不流动

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

据下列反应,Cu、Cd、Zn的还原性强弱顺序为何?

Zn + CuBr2 →Cu + ZnBr2

Cd + ZnBr2 →没有反应

Cu + CdBr2 →没有反应

Zn > Cu > Cd

Zn > Cd > Cu

Cu > Cd > Zn

Cd > Zn > Cu

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

图表所示为各物质的标准电极电势。据图,下列哪个是最强氧化剂?

K+

Al

Pb4+

Pb2+

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