bài tập trắc nghiệm hóa vô cơ - ôxi hóa khử
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1) CL có những mức oxi hóa nào trong các hợp chất bền nhất?
1. +2 2. +3 3. +5 4. +7
a. 1 và 2
b. 2, 3 và 4
c. 1 và 4
d. tất cả đều sai
2) Các chất sau đây: NO, N
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O
3
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2
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2
c.HNO
3
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