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ustaez258
2 năm trước
Câu 1: Tiến hành thí nghiệm: cho mẫu Na tác dụng với nước, sau đó nhúng quỳ tím vào sản phẩm. Hiện tượng nào sau đây đúng 1. Mẩu Natri tan ra 2. Có khí Hidro bay lên 3. Mẩu Natri không tan 4. Qùy tím chuyển màu xanh 5. Có khi oxi thoát ra
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