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Chemistry
12th Grade
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28 questions
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1.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Câu 57 Trong các kim loại: Fe, Al, Na, Cr, kim loại cứng nhất là
2.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Câu 58 Ở nhiệt độ cao, các phi kim như O2, Cl2, S oxi hóa Cr lên mức oxi hóa nào?
3.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Câu 59 Kim loại crom phản ứng với dung dịch nào?
4.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Câu 60 Kim loại crom không phản ứng với dung dịch nào?
5.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Câu 61 Crom bền với nước và không khí do có lớp màng chất X rất mỏng và bền bảo vệ. Chất X là
6.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Câu 62 Crom có số oxi hóa +6 trong hợp chất nào sau đây?
7.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Câu 63 Oxit lưỡng tính là
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