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dinhhoangbao
2 năm trước
Thêm NaOH dư vào dd chứa 8g sunfat của 1 kim loại hóa trị 2 rồi lọc kết tủa tách ra đem đun nóng thu dc oxit kim loại và dẫn một luồng khí H2 đi qua đến khi khử hết kim loại ta nhận dc 3,2g kim loại.Hỏi kim loại đó là gì?
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