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tranhaiyen188
2 năm trước
7- Một kim loại M có hóa trị II. PTK của bazơ đó là 58. ? M là kim loại nào sau đây? A. K C. Mg B. Na D. Cu 8. A là kim loại có hóa trị là x. PTK bazơ của kim loại đó là 40. A là kim loại nào sau đây? A. Ba B. Mn C. Ag D. Na 9- Có 2 ống nghiệm đựng 2 chất rắn Ba(OH)2 và Cu(OH)2 . Làm thế nào để nhận biết các hóa chất trên?
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