
ĐỀ CUONG GKII 10
Authored by TH-THCS-THPT Huong
Chemistry
10th Grade
Used 10+ times

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31 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Số oxi hoá của H trong đơn chất H2 là bao nhiêu?
0
+1
-1
-2
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Số oxi hóa của H trong phân tử H2O là
+1
1+
+2
0
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Số oxi hóa của S trong phân tử H2SO4 là
+2
2+
+6
+8
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Carbon (C) đóng vai trò chất oxi hóa trong phản ứng:
C + CO2 2CO
C + 2H2 CH4.
C + H2O CO + H2
C + O2 CO2.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Trong phản ứng hóa học: 2Cu + O2 2CuO, chất khử là
O2
Cu
CuO
Cu và O2
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Cho phương trình hóa học:
aZn + bHNO3 cZn(NO3)2 + dNO2 + eH2O. Tỉ lệ a: b là
1: 3.
1: 1.
1: 4
1: 2.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Dấu hiệu để nhận biết một phản ứng oxi hoá - khử là
có sự thay đổi màu sắc của các chất.
có sự thay đổi số oxi hoá của ít nhất một nguyên tố hóa học.
tạo ra chất khí.
tạo ra chất kết tủa.
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