
de on so 4 hk2 khoi 12
Authored by Quốc Trần
Chemistry
9th - 12th Grade
Used 1+ times

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40 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Công thức thạch cao sống là
CaSO4
CaSO4.2H2O
CaSO4.H2O
2CaSO4.H2O
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Phản ứng nào sau đây là phản ứng nhiệt nhôm?
Al cháy trong khí oxi.
Al tác dụng với C nung nóng.
Al tác dụng với CuO nung nóng
Nhiệt phân Al(OH)3
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Chất phản ứng được với dung dịch H2SO4 tạo ra kết tủa là
NaOH.
Na2CO3.
BaCl2.
MgCl2.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Trong bảng tuần hoàn, sắt ở nhóm:
VIIIB
VIIIA
VIB
VIA
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Người ta nhận biết ion Ca2+ bằng
nước
dd Na2CO3
quỳ tím
dd HCl
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Chất nào sau đây còn được gọi là vôi tôi?
CaO.
CaCO3.
Ca(OH)2.
Ca(HCO3)2.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Phương trình điện phân NaOH nóng chảy là
4NaOH → 4Na + O2 + 2H2O.
2NaOH → 2Na + O2 + H2.
2NaOH → 2Na + H2O2.
4NaOH → 2Na2O + O2 + H2.
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