
dien phan
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Science
12th Grade
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22 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Điện phân nóng chảy aluminium oxide Al2O3, ở anode xảy ra quá trình nào sau đây
Oxi hóa ion Al3+ thành Al.
Khử ion O2- thành O2.
Khử ion Al3+ thành Al.
Oxi hóa ion O2- thành O2.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Trong quá trình điện phân, những ion âm (anion) di chuyển về
anode, bị oxh
anode, bị khử
cathode, bị oxh
cathode, bị khử
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
điện phân dd Pb(NO3)2 với điện cực trơ. ion chì di chuyển về
cathode, bị oxh
cathode, bị khử
anode, bị oxh
anode, bị khử
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
điện phân dd ___ có khí thoát ra ở 2 điện cực từ lúc bắt đầu
Cu(NO3)2
FeCl2
K2SO4
FeSO4
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
điện phân dd ___, tại anode xảy ra quá trình oxh nước
NaCl
CuCl2
AgNO3
MgBr2
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
điện phân CaCl2 nóng chảy, ở cathode xảy ra qt
oxh ion Ca2+
khử ion Ca2+
oxh ion Cl-
Khử H2O (H+)
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
điện phân dd AgNO3 (điện cực trơ), ở cực âm xảy ra pư
Ag → Ag+ + 1e
Ag+ + 1e → Ag
2H2O → 4H+ + O2 + 4e
2H2O + 2e → H2 + 2OH-
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