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namnguvcl05
2 năm trước
19. Có 3 lọ bị mất nhãn, đựng các chất rắn sau: CuO, BaCl2, Na2CO3. Em hãy chọn duy nhất một thuốc thử để phân biệt ba chất rắn trên. * 0 điểm NaOH NaCl Quỳ tím H2SO4 8. Hòa tan hoàn toàn 3,25g một kim loại M (hóa trị II) bằng dung dịch H2SO4 loãng thu được 1,12 lít khí H2 (đktc). M là: * 0 điểm Zn Fe Cu Mg
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